Health Conditions

Erectile Function

Other NamesArteriogenic Erectile Dysfunction

Natural Remedies10

Ingredients48

Table of contents

Other Names

Arteriogenic Erectile DysfunctionCorporo-Venous Occlusive Erectile DysfunctionDrug-Induced Erectile DysfunctionEDErectile DysfunctionErectile Dysfunction Due to Arterial DiseaseErectile Dysfunction Due to Arterial InsufficiencyErectile InsufficiencyErection ProblemsImpotenceImpotence of Organic OriginImpotentia CoeundiMale Erectile DisorderMale Erectile DysfunctionMEDNeurogenic Erectile DysfunctionOrganic ImpotencePenile Erection DisorderPostprocedural Erectile DysfunctionPotency IssuesPsychogenic Erectile DysfunctionPsychogenic ImpotenceSexual DysfunctionSexual Dysfunction, PhysiologicalVasculogenic Erectile Dysfunction

Synopsis

Erectile Function: A Nutrition and Natural-Health Reference

1. Definition and Clinical Presentation

Erectile dysfunction (ED), formerly termed impotence, is defined as the failure to achieve or maintain a rigid penile erection suitable for satisfactory sexual intercourse. While no specific time is universally built into this definition, some authorities have suggested that the condition needs to persist for six months before being formally characterised as ED. It is important to distinguish between erectile function — the normal physiological capacity for penile erection — and erectile dysfunction, which describes its clinically significant impairment.

Approximately 10% of men aged 40–70 have severe or complete erectile dysfunction, defined as the total inability to achieve or maintain erections sufficient for sexual performance, with an additional 25% of men in this age category experiencing moderate or intermittent erectile difficulties. The disorder is highly age-dependent, as the combined prevalence of moderate to complete erectile dysfunction rises from approximately 22% at age 40 to 49% by age 70. Although less common in younger men, erectile dysfunction still affects 5–10% of men below the age of 40.

An epidemiological survey in 2000 estimated that approximately 150 million people suffer from ED worldwide, a figure projected to rise to 322 million by 2025. The combined prevalence of ED in adult males has been reported to exceed 20%, trending toward younger age, with ED patients aged 20–40 years accounting for 30% of the total number of patients.

ED carries a notable influence on life quality, with significant implications for family and social relationships. Erectile dysfunction impacts significantly on mood state, interpersonal functioning, and overall quality of life.

2. Physiology of Erectile Function: The Body Systems Involved

Normal erectile function represents a complex physiologic process requiring integrated synchronized function of vascular, neurologic, and musculoskeletal body systems, with significant psychological factors playing a role as well. A breakdown in any one of these body systems can contribute to the development of erectile dysfunction.

2.1 Vascular Mechanisms

Corporal smooth muscle relaxation of penile arteries and corpus cavernosum leads to penile erection, and results from parasympathetic/nonadrenergic noncholinergic neural pathway activation and simultaneous inhibition of sympathetic outflow. Normal erectile function involves the synthesis of nitric oxide (NO), the main neurotransmitter mediating erectile processes, and the subsequent accumulation of cyclic GMP (cGMP).

A nitric oxide/cyclic guanosine monophosphate mechanism has an important role in mediating the corporal smooth muscle relaxation necessary for erectile function; other mechanisms involving neuropeptides, gap junctions and ion channels also may modulate corporal smooth muscle tone.

Norepinephrine from sympathetic nerve endings and endothelins and prostaglandin F2α from the endothelium activate receptors on smooth muscle cells to initiate the cascade of reactions that eventually result in elevation of intracellular calcium concentrations and smooth muscle contraction — the state of detumescence. Relaxation of these same smooth muscles, driven by the nitric oxide pathway, produces engorgement and erection.

Up to 75% of ED patients have a stenosis of the iliac-pudendal-penile arteries, supplying the male genital organ's perfusion. Because atherosclerosis of penile arteries represents one of the most frequent ED causes, patients presenting with it should always be investigated for potential coexistent coronary or peripheral disease.

2.2 Neurological Mechanisms

ED occurs from multifaceted, complex mechanisms that can involve disruptions in neural, vascular, and hormonal signalling. Research on central neural regulation of penile erection is progressing rapidly with the identification of key neurotransmitters and the association of neural structures with both spinal and supraspinal pathways that regulate sexual function.

There appear to be plural neural, neurochemical, and endocrine mechanisms whose participation in erectile function depends on the behavioural context in which erection occurs.

2.3 Hormonal (Endocrine) Mechanisms

Androgens play a pivotal role in erectile mechanisms by regulating both nitric oxide synthase (NOS) and phosphodiesterase type 5 (PDE5) activity. Testosterone is considered the principal androgen involved in maintaining erectile tissue health, NOS expression, and libido. ED is a common condition associated with aging but not necessarily a consequence of aging.

2.4 Psychological and Psychosocial Factors

Erectile dysfunction is strongly related to both physical and psychological health. Psychogenic factors — including anxiety, depression, relationship stress, and performance pressure — can independently generate or substantially amplify ED. Erectile dysfunction can be due to vasculogenic, neurogenic, hormonal, veno-occlusive, psychogenic and/or pharmacogenic factors as well as alterations in the nitric oxide/cGMP or cAMP pathway or other regulatory mechanisms, resulting in an imbalance in corporal smooth muscle contraction and relaxation.

3. Contributing and Associated Factors

3.1 Cardiovascular Disease and Vascular Risk Factors

ED and cardiovascular disease (CVD) share many common risk factors, including age, hypertension, diabetes, insulin resistance, smoking, increased BMI, cholesterol, and lower HDL; there is a growing body of evidence that ED is a sentinel marker of subclinical CVD and likely precedes symptomatic coronary artery disease.

Independent risk factors for both ED and CVD are well recognised and include age, smoking, diabetes mellitus, hypertension, dyslipidaemia, depression, obesity, and a sedentary lifestyle. Compelling evidence exists that the most common underlying mechanism is vascular, and that CVD and ED share aetiologies as well as pathophysiology, with endothelial dysfunction as the common denominator.

Erectile dysfunction can have a neurogenic, psychogenic, or endocrinologic basis, but the most common cause is thought to be related to vascular abnormalities of the penile blood supply and erectile tissue often associated with cardiovascular disease and its risk factors.

3.2 Diabetes Mellitus

The prevalence of ED in diabetic males ranges from 35% to 90%. The pathophysiology of ED in diabetes mellitus is related to multiple mechanisms including endothelial dysfunction, accumulation of advanced glycation end products, oxidative stress, and neuropathy. Diabetes mellitus promotes the onset of ED via vasculopathy from endothelial dysfunction and autonomic neuropathy. The crude prevalence of erectile dysfunction was approximately 50% in individuals with diabetes.

3.3 Hypertension

Vasculogenic ED is considered part of a systemic vasculopathy and has a known relation with cardiovascular risk factors such as hypertension, diabetes, dyslipidaemia, and smoking. One large series using the IIEF-5 questionnaire to assess erectile function among hypertensive men found a 68.3% prevalence of ED.

3.4 Obesity and Metabolic Syndrome

Men with the metabolic syndrome demonstrate an increased prevalence of erectile dysfunction. After controlling for potential confounders, men with high waist circumference or an obese BMI were at approximately 50% increased odds of having ED compared with men with a low waist circumference or a normal BMI. In obese men with a sedentary lifestyle, a significantly higher incidence of ED is observed than in normal men.

3.5 Cigarette Smoking

Risk factors for erectile dysfunction include aging, chronic illnesses, various medications, and cigarette smoking. A follow-up study of the Massachusetts Male Aging Study revealed that cigarette smoking almost doubled the likelihood of moderate or complete ED. The crude prevalence of erectile dysfunction was 13.1% among current smokers in the NHANES survey population.

3.6 Age

Age has been the independent risk factor most consistently associated with erectile dysfunction, although other risk factors exist, play additional roles to varying degrees, and can mutually influence one another. As men age, many of the same risk factors for the development of cardiovascular disease also can have a detrimental effect on the organ systems needed for good erectile function.

3.7 Medications and Other Factors

Among the major risk factors are diabetes mellitus, heart disease, hypertension, and decreased HDL levels. Medications for diabetes, hypertension, cardiovascular disease, and depression may also cause erectile difficulties. Factors such as imbalance in the antioxidant defence system, vascular diseases, diabetes mellitus, accessory reproductive glands infection, obesity, as well as build-up of toxic substances play a role in age-related male reproductive malfunction.

4. Nutrients and Natural Ingredients: Traditional Use Versus Scientific Evidence

The following section distinguishes between historically documented traditional use and the current state of clinical or scientific research for each major nutrient or natural ingredient studied in relation to erectile function.

4.1 L-Arginine

Traditional/Nutritional Context: L-arginine is a conditionally essential amino acid found in protein-rich foods such as red meat, poultry, fish, and dairy products. It has been studied as a nutritional supplement in the context of cardiovascular and sexual health since the early recognition of the nitric oxide pathway.

Proposed Mechanism: L-arginine is the substrate of many enzyme pathways involved in the regulation of vascular tone, immune activation, and cell growth. As a substrate of nitric oxide synthase (NOS), it is catalysed by NOS to convert to NO.

Scientific Evidence: A meta-analysis assessed the efficacy and safety of daily oral L-arginine and PDE5 inhibitors alone or in combination in treating ED, searching PubMed, EMBASE, and Cochrane Library databases; four articles including 373 patients were studied, and erectile function was significantly improved in all three therapy groups compared with baseline.

A systematic review concluded that L-arginine, as a nutritional supplement, showed promising evidence for ED based on IIEF outcomes; the mechanisms of action remain unclear, but it appears to in part increase nitric oxide synthesis.

Evidence characterisation: The evidence for L-arginine as a standalone intervention is preliminary and based on small trials. Effects appear most pronounced when L-arginine is combined with other agents (see Pycnogenol below). Larger, well-designed RCTs are needed.

4.2 L-Citrulline

Traditional/Nutritional Context: L-citrulline is a non-essential amino acid found naturally in watermelon rind and other foods. It is an indirect precursor to L-arginine through the citrulline-arginine cycle and has been studied as an alternative route to increasing NO bioavailability.

Proposed Mechanism: L-citrulline is a precursor to NO similar to L-arginine. Unlike L-arginine, orally ingested citrulline is not substantially metabolised in the intestinal lining before entering the bloodstream, potentially offering more efficient conversion to arginine and thus NO.

Evidence characterisation: Clinical evidence from dedicated trials specifically in ED remains limited. Most evidence comes from small pilot studies and mechanistic inference from the arginine-NO pathway. Citrulline is frequently identified in the literature as a relevant nutritional substrate, but larger RCTs in ED populations are lacking.

4.3 Pycnogenol® (French Maritime Pine Bark Extract)

Traditional/Nutritional Context: Pycnogenol is a proprietary standardised extract derived from the bark of the French maritime pine (Pinus pinaster). It has been used in European phytomedicine and studied for its antioxidant and vascular effects.

Proposed Mechanism: Pycnogenol, an extract from the bark of French marine pine, is composed of proanthocyanidins, monocatechin, paclitaxel, phenolic acids, and other flavonoids. It is a very strong antioxidant that increases NO synthesis by catalysing endothelial NOS. When administered in combination with L-arginine, the substrate of eNOS, a synergistic effect of NO production can be achieved.

Scientific Evidence: Three studies with 184 patients were included in a 2023 meta-analysis of the Pycnogenol/L-arginine combination. There were no significant differences in baseline characteristics between groups. The results showed significant differences in IIEF erectile function domain scores, intercourse satisfaction, orgasmic function, overall satisfaction, and sexual desire between the combination treatment group and the control group.

A systematic review concluded that Pycnogenol and the combination product Prelox (Pycnogenol + L-arginine) have promising evidence as herbal products for ED based on IIEF outcomes; the mechanisms of action remain unclear, but they appear to in part increase nitric oxide synthesis.

Evidence characterisation: Evidence is promising but based on a small number of RCTs (three trials, totalling 184 subjects in the 2023 meta-analysis), with variable risk-of-bias ratings. The combination therapy (PAL) appears more studied than Pycnogenol alone. Further larger, well-controlled trials are warranted.

4.4 Panax Ginseng (Korean/Red Ginseng)

Traditional Use: Panax ginseng belongs to the Araliaceae family. In traditional medicine, ginseng is used to enhance physical and sexual strength, reduce stress and fatigue, and has anti-inflammatory and antioxidant properties. Ginseng root preparations have been central to East Asian traditional medical systems — including Traditional Chinese Medicine and Korean traditional medicine — for centuries, administered as decoctions, powders, and tonic preparations.

Proposed Mechanism: Studies have found that ginseng compounds increase nitric oxide in vascular endothelial cells. Ginseng relaxed corpus cavernosum smooth muscles and thus improved erectile function. Panax ginseng also showed therapeutic effects on ED through its antioxidant and anti-stress functions.

Scientific Evidence: A 2025 systematic review and meta-analysis of herbal dietary supplements for ED found that ginseng benefited erectile function, orgasmic function, sexual desire, overall satisfaction, and serum testosterone levels. The Cochrane review by Lee et al. (2022) offered the most rigorous evaluation of ginseng to date but was restricted to a single herb, with clinical benefits deemed only trivial in magnitude and largely derived from Korean populations.

Evidence characterisation: Ginseng is among the most studied herbal supplements for ED, with multiple RCTs and systematic reviews. The Cochrane review represents the highest quality of evidence and characterises the observed improvements as modest. Results come predominantly from Korean populations, limiting generalisability. Further multi-ethnic, large-scale RCTs are needed.

4.5 Tribulus terrestris

Traditional Use: Tribulus terrestris belongs to the Zygophyllaceae family. In traditional medicine, this plant is used to treat various diseases, such as cardiovascular diseases, diabetes, tumours, stomach problems, and urinary infections. It has also been used in Ayurvedic medicine and traditional Chinese medicine as an aphrodisiac and tonic for male sexual health.

Scientific Evidence: Evidence for Tribulus terrestris in ED remains insufficient, underscoring the need for larger, high-quality trials with longer follow-up. Tribulus terrestris was one of the most investigated supplements in RCTs reviewed in a 2025 systematic review, appearing in four of the 14 included studies; the age range of study subjects was 35–65 years and follow-up duration ranged from one to six months.

Evidence characterisation: Despite widespread traditional use and commercial popularity, current RCT evidence for Tribulus terrestris specifically in male ED is insufficient to support efficacy claims. Methodological quality of existing trials is variable.

4.6 Saffron (Crocus sativus)

Traditional Use: Saffron, derived from the dried stigmas of Crocus sativus, has been used in Persian, Greek, and Ayurvedic traditions as an aphrodisiac, mood enhancer, and tonic. It has been documented in traditional texts as a remedy for melancholy and sexual debility.

Proposed Mechanism: Saffron's active compounds — crocin, picrocrocin, and safranal — are proposed to act via antioxidant and neuroprotective mechanisms, improving penile rigidity and reducing stress.

Scientific Evidence: A meta-analysis of three clinical trials showed that saffron had a significantly positive effect on all dimensions of the Erectile Function questionnaire, including erectile function (mean difference = 5.36, p = 0.00), orgasmic function, overall satisfaction, intercourse satisfaction, and sexual desire. Interpretation of results is limited because of methodological flaws in the included studies, heterogeneity in erectile dysfunction status, and large statistical heterogeneity among trials; further studies are needed to confirm findings.

In the 2025 systematic review and meta-analysis of herbal dietary supplements for ED, saffron was effective in improving erectile function, orgasmic function, and intercourse satisfaction.

Evidence characterisation: Evidence is promising but based on a small number of trials with methodological limitations and high heterogeneity. Saffron's clinical effects on ED remain open to further investigation.

4.7 Eurycoma longifolia (Tongkat Ali / Malaysian Ginseng)

Traditional Use: Eurycoma longifolia Jack (Tongkat ali or Malaysian ginseng) has been traditionally used for management of male sexual dysfunction and infertility. E. longifolia, also named Tongkat Ali by locals in Malaysia, is a well-known botanical drug used as an aphrodisiac.

Scientific Evidence: A 200 mg supplement of Eurycoma longifolia and the practice of concurrent training for 6 months significantly improved the erectile function of men with androgen deficiency of aging males (ADAM). Eurycoma longifolia increased testosterone levels in almost 50% of study participants in this trial. This was a 6-month randomised, double-blind, placebo-controlled four-arm design involving 45 men aged approximately 47 years.

Based on the literature evaluated, products which contain Tongkat ali showed a clinical benefit on improving erectile dysfunction as well as a good safety profile.

Evidence characterisation: Evidence for Tongkat Ali in ED is preliminary, with a small number of controlled trials involving modest participant numbers. One limitation of the key trial was the absence of groups using only one intervention at a time, making it difficult to attribute effects solely to the supplement. More large-scale RCTs are warranted.

4.8 Epimedium / Icariin (Horny Goat Weed)

Traditional Use: Epimedium herb has been widely used in ancient Chinese medicine to enhance sexual activity. It has been widely used in East Asian countries for centuries, under names such as Epimedium brevicornum Maxim and E. sagittatum Maxim. Preparations historically included water and alcohol decoctions of the dried leaves.

Proposed Mechanism: Modern studies have shown that epimedium herb is rich in icariin (ICA, a flavonoid compound), and 91.2% of icariin is converted to icariside II by hydrolytic enzymes in intestinal bacteria after oral administration. The proposed mechanism includes PDE5 inhibition, promoting smooth muscle relaxation and increasing blood flow.

Scientific Evidence: Oral treatment with icariin for 4 weeks potentially improves erectile function in castrated rats, correlated with an increase in penile smooth muscle and the expression of certain NOS isoforms in the corpus cavernosum. Human clinical trials with icariin or Epimedium extracts specifically for ED are very limited; the majority of current evidence comes from animal and in vitro studies.

Evidence characterisation: Evidence in humans is weak. Most data are from pre-clinical (animal and in vitro) studies. Robust human RCTs in ED populations are currently lacking. This is a traditional-use agent for which the scientific evidence base remains nascent.

4.9 Yohimbine (Pausinystalia yohimbe)

Traditional Use: Yohimbine is the primary alkaloid extracted from the bark of the Central and West African tree Pausinystalia yohimbe. It has historically been used as an aphrodisiac in traditional West African medicine and was one of the earliest pharmacologically characterised agents used for erectile dysfunction in Western medicine.

Proposed Mechanism: Yohimbine is a pharmacologically well-characterised alpha-2-adrenoceptor antagonist with activity in the central and peripheral nervous system, and has been used for over a century in the treatment of erectile dysfunction.

Scientific Evidence: A randomised, controlled study with partial crossover design tested yohimbine versus placebo in 100 organically impotent men; the first phase showed a positive response in 42.6% of patients receiving yohimbine versus 27.6% in the placebo group, though these values did not reach statistical significance (p = 0.42). The response rate of organically impotent patients to yohimbine is, at best, marginal.

Evidence characterisation: Evidence is mixed and of generally modest quality. Yohimbine has been studied more extensively than many natural agents for ED, but the clinical benefit, particularly in organic (vasculogenic/neurogenic) ED, is considered marginal. It may have a more meaningful role in psychogenic ED. Yohimbine carries regulatory restrictions in several jurisdictions due to safety concerns at higher doses.

4.10 Vitamin D

Nutritional Context: Vitamin D (primarily as D3, cholecalciferol) is both a dietary micronutrient and a steroid prohormone synthesised in skin upon ultraviolet exposure. Dietary sources include fatty fish, egg yolks, and fortified foods.

Proposed Mechanisms: Vitamin D regulates nitric oxide synthesis, thereby promoting vasodilation. It also exerts anti-inflammatory effects by enhancing anti-inflammatory cytokines, reducing pro-inflammatory cytokines, and downregulating the renin-angiotensin system. Impaired vitamin D activity is associated with increased production of reactive oxygen species and diminished antioxidative capacity, both of which may contribute to the development of endothelial dysfunction. The relationship between vitamin D and ED may also be modulated by hormonal pathways, as several studies have reported an association between vitamin D deficiency and lower testosterone concentrations.

Scientific Evidence: Out of 1,335 identified articles, 10 studies met inclusion criteria in a 2025 systematic review, encompassing over 13,000 men. Observational studies consistently showed that men with moderate-to-severe or arteriogenic ED had significantly lower serum vitamin D levels. Despite the observational data, current randomised controlled trials provide inconclusive evidence regarding the therapeutic benefit of vitamin D supplementation in improving erectile function.

Previous research across the general US population showed that vitamin D deficiency was associated with increased erectile dysfunction prevalence. While observational studies have established the presence of an association between vitamin D levels and ED, there is a paucity of study regarding the efficacy of vitamin D supplementation on ED.

In a small pilot study of 28 men, the IIEF score was increased significantly in men with vitamin D deficiency (from 11.2 ± 4.9 to 14.2 ± 5.8, p<0.01), while no significant improvement was observed in men without vitamin D deficiency.

Evidence characterisation: The association between vitamin D deficiency and ED is consistently reported across observational studies but is confounded by shared risk factors (obesity, cardiovascular disease). Interventional evidence from RCTs is currently inconclusive. Vitamin D status screening in men with ED is suggested by some authorities, particularly in the context of known deficiency.

4.11 Zinc

Nutritional Context: Zinc is an essential trace mineral found in red meat, shellfish (especially oysters), legumes, seeds, and whole grains. It is required as a cofactor for hundreds of enzymes and plays a documented role in testosterone biosynthesis.

Proposed Mechanism: Previous study proved close interdependence of zinc and testosterone production, and hence a link between zinc and erectile dysfunction. Zinc acts as a cofactor in the activity of enzymes involved in androgenic hormone synthesis.

Scientific Evidence: In a prospective pilot study, all patients were given vitamin D3 1,000 IU/day and zinc 12 mg/day for 12 weeks. In patients with erectile dysfunction, there is a strong association between vitamin D and testosterone levels (ρ = 0.728, p<0.000). Vitamin D level reduction, concomitantly with decreased testosterone and increased cholesterol, contributes to the development and maintenance of erectile dysfunction, more probably through endothelial mechanisms.

Evidence characterisation: The specific contribution of zinc supplementation to erectile function, independent of its role in testosterone biosynthesis, is not well established in large RCTs dedicated to ED. Evidence linking zinc deficiency to hypogonadism is more robust than direct evidence for zinc's effect on erection quality.

4.12 Maca (Lepidium meyenii)

Traditional Use: Maca is a root vegetable native to the high Andes of Peru, where it has been cultivated and consumed as a food staple and traditional medicine for centuries. Andean populations have historically used it to enhance energy, stamina, and fertility.

Scientific Evidence: Evidence for Maca in ED specifically remains insufficient, underscoring the need for larger, high-quality trials with longer follow-up. In a 2025 systematic review of 14 RCTs, only one study specifically investigated Maca as an intervention for ED.

Evidence characterisation: Evidence for Maca in male ED is currently insufficient, despite its long traditional use and popularity as a natural supplement. Limited and small RCTs have shown some signal for sexual function improvements, but robust evidence in ED specifically is lacking.

5. Dietary and Lifestyle Factors

5.1 The Mediterranean Dietary Pattern

A dietary pattern which is high in fruit, vegetables, nuts, whole grains, and fish but low in red and processed meat and refined grains is more represented in subjects without ED.

Published studies showed that adherence to a Mediterranean diet contributes to preventing ED through improved lipid and glucose metabolism, increased antioxidant defences, and increased arginine levels which could raise nitric oxide activity. These findings suggest that the encouragement of a healthy lifestyle, such as Mediterranean diet promotion, could be an attractive dietary approach to prevent ED and preserve sexual function.

In type 2 diabetic men, those with the highest adherence to the Mediterranean diet had the lowest prevalence of ED and were more likely to be sexually active. In clinical trials, the Mediterranean diet was more effective than a control diet in ameliorating ED or restoring absent ED in people with obesity or metabolic syndrome.

A landmark Italian intervention study (published in the Journal of Urology) examined 65 men with metabolic syndrome and ED: men were identified from a database of subjects participating in controlled trials evaluating the effect of lifestyle changes and included if they had a diagnosis of ED associated with metabolic syndrome; 35 were assigned to the Mediterranean-style diet and 30 to the control diet. After 2 years, men on the Mediterranean diet consumed more fruits, vegetables, nuts, whole grain, and olive oil compared with men on the control diet.

A systematic review demonstrated that a Mediterranean diet is an effective means to both prevent and improve erectile dysfunction. Per the American Urological Association (AUA) guidelines for ED, clinicians ought to counsel men with comorbidities known to negatively affect erectile function that lifestyle modifications, including changes in diet and increased physical activity, may improve erectile function (Moderate Recommendation).

5.2 Physical Activity and Exercise

Results from systematic evidence provide compelling evidence that cigarette smoking, alcohol, and physical activity are important for sexual dysfunction. Regular aerobic exercise improves endothelial function, reduces adiposity, and positively affects cardiovascular risk factors — all mechanistically relevant to erectile function. Improved diet and exercise should be considered in the management of ED, particularly in patients with obesity or diabetes mellitus.

In one 6-month RCT, erectile function demonstrated improvements with both concurrent training and Eurycoma longifolia supplementation; however, the most significant results were obtained by men allocated to the concurrent training plus Eurycoma longifolia group. This finding underscores the importance of physical activity as an independent contributor to erectile function, potentially amplifying the effects of natural supplementation.

5.3 Smoking and Alcohol

A review of the Massachusetts Male Aging Study revealed that, after adjusting for age, a higher probability of ED correlated with a history of prior heart disease, hypertension, and diabetes; a follow-up study revealed that cigarette smoking almost doubled the likelihood of moderate or complete ED.

After adjusting for age, the correlation between ED and modifiable risk factors — hypertension, diabetes, hyperlipidaemia, obesity, sedentary behaviour, and smoking — remained significant.

5.4 Obesity and Weight Management

The crude prevalence of erectile dysfunction was 21.8% among obese individuals (BMI >30 kg/m²) in NHANES survey data. Weight reduction through dietary intervention and exercise has been shown in clinical trials to improve endothelial function, inflammatory markers, and erectile function scores. In the Mediterranean diet metabolic syndrome trial, endothelial function scores and inflammatory markers (C-reactive protein) improved in the intervention group, but remained stable in the control group.

5.5 Dietary Fat Quality and Cardiometabolic Diet

The Mediterranean diet is characterised by high consumption of monounsaturated fatty acids, mainly from olives and olive oil, and suggests daily consumption of fruits, vegetables, whole grain cereals, and low-fat dairy products, with weekly consumption of fish. This pattern supports vascular health through reduction of systemic inflammation, improvement of lipid profiles, and support of endothelial nitric oxide production — mechanisms directly relevant to erectile physiology.

In a study of 150 male stable heart failure patients, the SHIM-5 erectile function score was positively correlated with the Mediterranean diet score (p = 0.006), while Mediterranean diet score was negatively associated with carotid intima-media thickness (p < 0.001) and serum prolactin levels (p = 0.05).

6. Summary of Evidence Quality

Strongest evidence (multiple systematic reviews / RCTs / large observational studies): Mediterranean dietary pattern; cardiovascular risk factor management (hypertension, diabetes, dyslipidaemia, obesity, smoking cessation); physical activity.
Moderate evidence (systematic reviews of small-to-moderate RCTs): L-arginine (especially in combination with Pycnogenol/L-citrulline); Panax ginseng (Cochrane review characterises benefits as modest); saffron (Crocus sativus).
Preliminary / insufficient evidence (small RCTs, high bias risk, animal data): Tribulus terrestris; Lepidium meyenii (Maca); Eurycoma longifolia (Tongkat Ali); Vitamin D supplementation (interventional); Zinc (direct erectile-function RCTs lacking); Yohimbine (marginal, mixed evidence).
Predominantly pre-clinical (animal/in vitro) evidence in humans: Icariin / Epimedium in clinical ED populations.

References

Natural Remedies

Remedy 1

Mediterranean-Style Diet: A diet rich in fruits, vegetables, whole grains, legumes, nuts, and healthy fats supports vascular health and blood flow — both critical for erectile function. Men following a Mediterranean diet rich in flavonoids have shown significantly lower rates of erectile dysfunction; aim to fill your plate with leafy greens, fatty fish, avocados, and berries daily.

Remedy 2

L-Arginine-Rich Foods: L-arginine is an amino acid the body converts to nitric oxide, which relaxes blood vessels and improves circulation to erectile tissue. Foods naturally high in L-arginine include pumpkin seeds, walnuts, turkey, and chickpeas — incorporating these regularly can support healthy blood flow as part of a balanced diet.

Remedy 3

Panax (Korean) Ginseng: Panax ginseng is one of the most studied herbal remedies for erectile function, with clinical research showing it can meaningfully improve erectile function scores compared to placebo. It is believed to work partly by increasing nitric oxide synthesis; typical traditional use involves standardized root extracts taken daily, but consult a healthcare provider before starting.

Remedy 4

Saffron: Saffron has been evaluated in multiple randomized controlled trials and shown to improve erectile function, orgasmic function, and intercourse satisfaction. Add a small pinch of saffron threads to warm milk, tea, or rice dishes — a traditional use across Persian and Ayurvedic medicine for vitality and reproductive wellness.

Remedy 5

Regular Aerobic Exercise: Exercise improves blood pressure, blood flow, mood, and stamina — all of which directly support erectile function. A Harvard study found that just 30 minutes of walking daily reduced erectile dysfunction risk by 41%; aim for at least 150 minutes of moderate aerobic activity per week through walking, cycling, or swimming.

Remedy 6

Pelvic Floor (Kegel) Exercises: Strengthening the pelvic floor muscles can help men achieve and maintain erections by improving blood retention in erectile tissue and supporting muscular control. To perform: identify the muscles you use to stop urine flow, then contract and hold for 3–5 seconds, release, and repeat 10–15 times per session, two to three times daily.

Remedy 7

Stress Reduction & Mindfulness: Stress and anxiety have a significant effect on sexual desire and erectile function, making mind-body practices a practical natural approach. Incorporate daily mindfulness meditation, deep diaphragmatic breathing, or yoga — even 10–20 minutes per day has been shown in natural-health practice to lower cortisol levels and support hormonal balance.

Remedy 8

Quality Sleep: Poor or insufficient sleep is closely linked to lower testosterone levels and impaired sexual function. Prioritize 7–9 hours of consistent, uninterrupted sleep per night by maintaining a regular bedtime, reducing blue-light exposure in the evening, and keeping the bedroom cool and dark — all well-established sleep-hygiene practices.

Remedy 9

Maca Root: Lepidium meyenii (maca), a Peruvian root vegetable, has a long history of traditional use for libido and male reproductive health, with preliminary clinical trials showing positive results. Maca powder can be stirred into smoothies, oatmeal, or warm water — start with 1–3 grams daily and allow several weeks of consistent use to assess benefit.

Remedy 10

Limiting Alcohol & Quitting Smoking: Smoking narrows blood vessels and reduces blood flow to erectile tissue, while excessive alcohol disrupts hormonal balance and nerve signaling — both directly worsen erectile function. Quitting smoking and moderating alcohol intake (no more than one to two drinks per day) are among the most impactful natural steps a person can take to protect and restore erectile health.

Ingredients

These ingredients are often used in alternative medicine to support erectile function.

acetyl-L-carnitineScientific
Acetyl-L-Carnitine (ALC) has been studied in clinical trials for erectile dysfunction, particularly in aging men and post-prostatectomy patients. Combined with Propionyl-L-Carnitine (2 g/day each), it outperformed oral testosterone in improving erectile function and nocturnal penile tumescence in a randomized study of 120 aging men. It modulates androgen activity and supports nerve function relevant to erection.
ALA (alpha-lipoic acid)Scientific
ALA has been studied in men with erectile dysfunction (ED), particularly in the setting of type 2 diabetes mellitus. Clinical evidence includes a randomized prospective trial in 45 diabetic men with ED and a trial in 123 diabetic men with ED evaluating a nutraceutical combination containing ALA. The proposed mechanism involves improving nitric oxide bioavailability through eNOS recoupling.
alpinia galangalScientific
A 2023 triple-blind RCT in 60 adult males on SSRIs found that 500 mg/day of A. galanga extract significantly improved IIEF scores vs. placebo (p<0.001, Cohen's d=0.49). The plant has also been shown to enhance androgenic activity and is linked to testosterone elevation in preclinical models.
arginine alpha ketoglutarateScientific
The arginine component of AAKG is a precursor to NO in penile vascular tissue, and L-arginine RCTs show modest benefit in mild-to-moderate erectile dysfunction. Direct AAKG-specific evidence is very limited, with most data extrapolated from L-arginine trials; combining AAKG with PDE5 inhibitors has been proposed as additive.
ashwagandhaScientific
Ashwagandha (Withania somnifera) has been studied for psychogenic erectile dysfunction in an Ayurvedic clinical trial (AYU, 2011), and a separate RCT documented significant improvement in sexual function and testosterone in men. The 2023 MDPI dietary supplement analysis listed Withania somnifera among ingredients with one positive clinical reference for ED. Its stress-adaptogenic and testosterone-supportive properties are mechanistically relevant to erectile function.
barrenwortScientific
Icariin from Barrenwort inhibits phosphodiesterase type 5 (PDE5) and upregulates endothelial and neuronal nitric oxide synthase (eNOS/nNOS) in penile tissue, mechanisms directly relevant to erectile function. Animal studies demonstrate dose-dependent improvements in intracavernous pressure and smooth muscle preservation in nerve-injured rats. Epimedium has been used in Chinese clinical preparations for erectile dysfunction, though large-scale controlled human trials remain limited.
cordycepsScientific
Cordyceps (Cordyceps sinensis/militaris) has traditional use in Tibetan and Chinese medicine as a kidney-yang tonic for sexual debility and impotence. Clinical studies in China have reported improvements in sexual function and libido. The active compound cordycepin and adenosine analogs may enhance NO production and testosterone synthesis relevant to erectile function.
D-aspartic acidScientific
NMDA receptors in the hypothalamic paraventricular nucleus play a documented role in mediating penile erection via nitric oxide signaling, and D-Asp is an endogenous NMDA receptor agonist. Animal research shows that excitatory amino acid levels, including D-Asp-related ligands, rise in the paraventricular nucleus during sexual activity and that NMDA receptor blockade impairs erectile responses. No human RCTs have directly tested DAA supplementation for erectile dysfunction.
DHEA (dehydroepiandrosterone)Scientific
The Massachusetts Male Aging Study identified DHEAS as the only hormone out of 17 tested that correlated significantly with erectile dysfunction. A small double-blind RCT in men with low DHEAS and ED showed improvement in International Index of Erectile Function scores with 50 mg/day DHEA over six months. Evidence is limited and inconsistent; DHEA is a weak androgen and does not restore erections in castrated animal models.
dogwoodScientific
Cornus officinalis extract has been studied in preclinical models for erectile dysfunction. One in vitro and in vivo study found concentration-dependent relaxation of corpus cavernosum tissue and significantly elevated intracavernous pressure in rats after oral administration. Human trial data are absent.
eucommiaScientific
In STZ-induced diabetic rats, eucommia leaf extract (16 weeks) significantly increased intracavernosal pressure, NO levels, cGMP, and testosterone, and improved erectile function via the Akt-eNOS pathway and HPG axis enhancement. Traditional use for male impotence is well documented in TCM. Human clinical trials are lacking.
eurycoma longifoliaScientific
Eurycoma longifolia is the botanical source of Tongkat Ali, supported by multiple RCTs for erectile function improvement. Its active compounds (eurycomaoside, eurycomanone) are linked to testosterone support and inhibition of Rho-kinase II in penile smooth muscle. A systematic review of human clinical trials confirms its significance in managing erectile dysfunction and low libido in men.
fenugreekScientific
Fenugreek (Trigonella foenum-graecum) has been studied for male sexual function in clinical trials, primarily for libido and sexual arousal, with some evidence for erectile function. A randomized, double-blind, placebo-controlled crossover study (World J Mens Health, 2021) found a combination including testofen (fenugreek extract) and L-citrulline significantly improved IIEF scores including erectile function domains. Fenugreek's furostanolic saponins may modulate testosterone levels.
forskohlii rootScientific
Intracavernosal injection of forskolin has been investigated as a treatment for vasculogenic erectile dysfunction, as cAMP promotes smooth muscle relaxation and penile blood flow. Small human studies suggest efficacy when administered by direct injection.
ginkgo bilobaScientific
A 2021 systematic review of 5 RCTs (475 participants) concluded that ginkgo biloba has limited positive effects on sexual function overall. Evidence for male erectile function specifically is weak, with preclinical data showing benefit after nerve injury but human trial results being inconsistent. The overall clinical evidence does not currently support ginkgo as an effective monotherapy for erectile dysfunction.
ginsengScientific
Panax (Korean red) ginseng is among the most clinically studied natural treatments for erectile dysfunction. A systematic review of 7 RCTs (n=349) published in BJC Pharmacology (2008) showed a significant effect vs placebo (risk ratio 2.40; 95% CI 1.65–3.51, p<0.00001). A subsequent meta-analysis of 5 RCTs (n=369) confirmed significantly improved IIEF scores (pooled MD=2.67, p=0.0009).
ginsenosidesScientific
Ginsenosides are the primary bioactive compounds in Panax ginseng responsible for its effects on erectile function. They promote endothelial nitric oxide synthesis and relax corpus cavernosum smooth muscle. Clinical trials of ginseng preparations standardized to ginsenoside content have demonstrated significant improvements in IIEF scores in ED patients.
horny goat weedScientific
Horny goat weed (Epimedium spp.) contains icariin, which inhibits PDE5 in corpus cavernosum smooth muscle cells in vitro—the same target as sildenafil. Animal studies in aged, diabetic, and castrated rats demonstrate efficacy for erectile dysfunction. Traditional Chinese medicine has used it for centuries for impotence.
icariinScientific
Icariin is the primary bioactive flavonoid glycoside in horny goat weed (Epimedium spp.) and has been shown to inhibit phosphodiesterase type 5 (PDE5) in vitro, elevating cGMP levels in corpus cavernosum smooth muscle cells. Animal studies demonstrate it improves erectile function in aged, diabetic, and castrated rodent models. No completed human RCT exists, but the mechanism mirrors that of PDE5 inhibitor drugs.
L-arginineScientific
L-arginine is a precursor to nitric oxide (NO), essential for penile smooth muscle relaxation and erection. A 2022 multicentre, double-blind, placebo-controlled RCT (N=98) showed 6 g/day for 3 months significantly improved IIEF-6 scores (p<0.0001) in vasculogenic ED patients. A 2021 meta-analysis of RCTs confirmed significant improvement in erectile function with L-arginine alone or combined with PDE5 inhibitors.
l-carnitineScientific
Clinical studies show propionyl-L-carnitine and acetyl-L-carnitine can improve erectile function, particularly in men with diabetic or post-surgical neurogenic erectile dysfunction. One study found carnitine improved sildenafil response in men with diabetes who had not previously responded; another found a combination enhanced outcomes post-prostatectomy.
L-citrullineScientific
L-Citrulline is a non-essential amino acid that is efficiently converted to L-arginine in the kidneys, raising plasma arginine levels more sustainably than direct L-arginine supplementation. A randomized, double-blind, placebo-controlled crossover pilot study (Sexual Medicine, 2018) showed L-citrulline combined with resveratrol improved erectile function in PDE5 inhibitor-using men. It is recognized as a nutraceutical for ED in multiple 2023 reviews.
macaScientific
Maca (Lepidium meyenii) root, traditionally cultivated in the Peruvian Andes for fertility and sexual vitality, has been evaluated in RCTs for erectile dysfunction. A 2009 randomized double-blind clinical trial (Andrologia) showed significant improvement in IIEF-5 scores vs placebo in mild ED. A 2010 systematic review (BMC Complement Altern Med) found significant positive effects on sexual dysfunction in RCTs, including one specifically assessing IIEF in ED patients.
morindaScientific
M. officinalis oligosaccharides (MOO) alleviated CUMS-induced erectile dysfunction in mice alongside antidepressant effects, operating via HPG axis normalisation and BDNF/TrkB/CREB pathway activation. Traditional TCM documentation for impotence (erectile dysfunction) as a primary indication dates to the Shennong Bencao Jing.
PABA (para-aminobenzoic acid)Scientific
PABA (as Potaba) has been evaluated in Peyronie's disease, a connective tissue disorder of the tunica albuginea causing penile curvature, pain, and erectile dysfunction. A randomized placebo-controlled trial of 103 men over 12 months found higher response rates and significant plaque size reduction with Potaba versus placebo. The European Association of Urology gives a Grade B recommendation for its use in reducing plaque size and pain.
pineScientific
A double-blind RCT (n=21, 120 mg/day for 3 months) showed Pycnogenol improved erectile function from moderate to mild stage (IIEF-5 score improvement of 33%) versus placebo. A combination of Pycnogenol with L-arginine further improved erectile dysfunction in additional RCTs. Mechanism involves enhanced NO-mediated vasodilation.
pine barkScientific
Pine bark extract (Pycnogenol, from Pinus pinaster) has been evaluated in clinical studies for erectile dysfunction, primarily in combination with L-arginine. Two studies testing 120 mg/day of Pycnogenol as a sole intervention reported improvements in erectile function. A 2023 meta-analysis (Frontiers Endocrinology) of the Pycnogenol–L-arginine combination confirmed significant IIEF improvements.
pomegranateScientific
A pilot RCT (n=53) reported improved erectile function scores with 8 oz pomegranate juice daily for 28 days in men with mild-to-moderate ED, though statistical significance vs. placebo was not fully reached. The proposed mechanism is enhanced nitric oxide production and improved penile blood flow. Evidence is promising but limited.
propionyl-L-carnitineScientific
Propionyl-L-Carnitine (PLC) has been studied in randomized, double-blind, controlled trials for erectile dysfunction, particularly in diabetic and prostatectomy patients. A 2004 RCT (Curr Med Res Opin) found PLC 2 g/day plus sildenafil significantly outperformed sildenafil alone in sildenafil-refractory diabetic ED. A 3-month study combining PLC with L-arginine and niacin showed statistically significant IIEF improvement.
rhodiolaScientific
An open clinical trial of 35 men with erectile dysfunction and/or premature ejaculation found that 150–200 mg/day of Rhodiola extract over three months produced substantially improved sexual function in 26 of the participants. A separate small trial of 40 participants reported that 75% experienced improved sexual performance after taking 2000 mg/day of Rhodiola extract for one month. The evidence base is small and methodologically limited, with no placebo-controlled RCTs specifically for ED.
saffronScientific
Saffron (Crocus sativus) has traditional use as an aphrodisiac in Middle Eastern and South Asian medicine. A 2018 systematic review and meta-analysis (PMC6727438) found saffron had a significantly positive effect on all domains of the Erectile Function questionnaire (MD for EF domain=5.36, p=0.00) based on 3 clinical trials. A topical saffron gel RCT in diabetic ED patients also showed positive results.
saw palmettoScientific
Preclinical data show saw palmetto extract inhibits phosphodiesterase-5 (PDE5) activity and increases inducible nitric oxide synthase (iNOS) expression in corpus cavernosum tissue. A multicenter 6-month open-label pilot study in BPH patients found significant improvement in sexual dysfunction scores alongside urinary symptom improvement. Evidence is preliminary and human trials are not placebo-controlled for erectile function specifically.
sumaScientific
The same Arletti et al. (1999) rat study demonstrated that P. paniculata extract improved copulatory performance in sexually impotent rats, including metrics directly related to erectile and ejaculatory function. This is the primary published evidence for this link, supported by traditional use as a sexual restorative.
tongkat aliScientific
Tongkat Ali (Eurycoma longifolia) root extract is traditionally used as an aphrodisiac in Southeast Asia and has been studied in RCTs for erectile function. A meta-analysis of RCTs (2015, Complementary Therapies in Medicine) and a 6-month double-blind RCT (2020, Phytomedicine) both reported improvements in IIEF-5 erectile function scores. A systematic review noted clinical benefit on erectile function with a good safety profile.
tribulusScientific
Tribulus (Tribulus terrestris) has been investigated in RCTs for erectile dysfunction with some positive and some null findings. Its protodioscin content may enhance nitric oxide release in penile tissue. A 2023 systematic review identified it among the botanicals with multiple positive RCTs for ED using IIEF outcomes.
tribulus terrestrisScientific
Tribulus terrestris has been studied in prospective, double-blind, placebo-controlled RCTs for erectile dysfunction, with mixed but partially positive findings. Its steroidal saponins (protodioscin) may enhance androgen receptor sensitivity and nitric oxide release. A 2023 systematic review identified it among the six botanicals with at least two positive RCTs for ED.
velvet beanScientific
MP is classified in Ayurvedic medicine as 'vajikarna' (aphrodisiac/virility enhancer). Clinical studies demonstrate MP restores testosterone, dopamine, and LH levels in infertile men, all of which support erectile function. Preclinical data show MP may increase nitric oxide (NO) production, improving penile blood flow. A review of clinical and preclinical trials (2025) specifically examined MP for erectile dysfunction in type 2 diabetes patients.
watermelonScientific
Watermelon-derived L-citrulline supports erectile function by raising L-arginine and nitric oxide levels, facilitating penile smooth muscle relaxation and increased blood flow. A small but significant RCT confirms L-citrulline supplementation improves erection hardness in mild ED. Epidemiological data also link higher dietary lycopene intake to lower ED risk.
yohimbeScientific
Yohimbe is the bark of Pausinystalia yohimbe, the primary natural source of the alkaloid yohimbine, which has established alpha-2 adrenergic blocking activity relevant to erectile function. It has long traditional use in West Africa as an aphrodisiac. Multiple RCTs of yohimbine (the purified alkaloid) support the mechanism; the bark extract is the traditional delivery form.
yohimbineScientific
Yohimbine is an alpha-2 adrenergic receptor antagonist derived from Pausinystalia yohimbe bark, with one of the longest clinical histories for erectile dysfunction. Multiple RCTs and meta-analyses support efficacy in psychogenic and mixed-type ED. It is recognized by the AUA and international guidelines as having clinical evidence for ED.
zincScientific
Zinc is essential for testosterone biosynthesis and is recognized as a cofactor for enzymes involved in sexual function. Clinical evidence links zinc deficiency to hypogonadism and erectile dysfunction; zinc supplementation in deficient men restores testosterone and improves sexual function. A 2023 animal study (Redox Rep) mechanistically confirmed zinc improves erectile function by preventing penile oxidative injury and upregulating testosterone.
boxthorneTraditional
Traditional Chinese medicine uses boxthorn as a male tonic for sexual function, with the berry's testosterone-raising and HPG-axis-activating properties providing a plausible mechanism. Animal studies show LBP restores sexual behavior in diabetic mice. No dedicated human RCT has assessed erectile function as a primary outcome.
broomrapeTraditional
Broomrape (Orobanche spp.) has a long-documented history of use as a remedy for impotence in Traditional Chinese Medicine (TCM), Tibetan medicine, and Western herbal traditions. The closely related Cistanche (also called broomrape in English, Orobanchaceae family) has preclinical animal evidence supporting its androgen-modulating effects. No controlled human trials specifically on erectile function exist for either Orobanche or Cistanche alone.
coleus forskohliiTraditional
Coleus forskohlii has a documented traditional use for sexual problems in men in Ayurvedic medicine. Forskolin's cAMP-elevating action on smooth muscle relaxation provides a plausible mechanistic basis. No human clinical trials on erectile function have been published.
cowage seedTraditional
Cowage seed has documented traditional use as an aphrodisiac in Ayurveda and Unani medicine for erectile function. Human clinical studies show it raises testosterone and lowers prolactin, both relevant to erectile function, and one published study noted M. pruriens may increase nitric oxide production. No dedicated ED randomized clinical trial exists.
damianaTraditional
Damiana (Turnera diffusa) has been used traditionally in Mexico and Central America as an aphrodisiac and sexual tonic, particularly for erectile dysfunction and libido in men. It has been included in clinical combination herbal studies (e.g., VigRx Plus RCT) that showed IIEF improvements in mild-to-moderate ED. Isolated clinical evidence for Damiana alone is limited to traditional use and animal studies.
dodderTraditional
Dodder seed (Tu Si Zi) is a classical TCM tonic for kidney-yang deficiency, where impotence is a primary indication. It is described in traditional materia medica for treating 'impotence, nocturnal emission, and frequent urination.' TCM practitioners use it as an aphrodisiac and tonic for sexual function. Scientific mechanistic evidence from animal studies exists, but no human clinical trials specifically addressing erectile function have been published.
muira puamaTraditional
Muira Puama (Ptychopetalum olacoides) is a Brazilian Amazonian shrub with long traditional use as a sexual tonic and aphrodisiac for erectile dysfunction. An open-label clinical study (1994, Institute of Sexology, Paris) in 262 men with sexual dysfunction reported 51% rated it effective for ED. It was included in the VigRx Plus double-blind RCT that showed IIEF improvements in mild-to-moderate ED men.