tribulus

Tribulus (Tribulus terrestris L.): A Comprehensive Reference

1. Identity, Botany, and Natural Sources

Botanical name: Tribulus terrestris L. Family: Zygophyllaceae. Tribulus terrestris (TT) is a plant that grows especially in South Africa, Australia, India, and Europe, and is part of the Zygophyllaceae family, a widespread family with 25 genera and about 250 species. TT is a crawling herbal plant that generally grows in arid climates and sandy soils and grows up to one meter high. The name Tribulus comes from the Greek name "tribolos", meaning "spike fruit."

The plant is mainly found in Mediterranean and sub-tropical regions such as India, China, South America, Mexico, Spain, Bulgaria, and Pakistan. It is a small, prostrate, 10–60 cm high, hirsute or silky hairy shrub, with leaves that are opposite, often unequal, paripinnate with 5 to 8 pairs, and elliptical or oblong-lanceolate. It has small, yellow flowers with five petals and spiky fruits covered in sharp thorns, which give it the common nickname "puncture vine."

Common names: puncture vine, goathead, caltrop, bindii. In Ayurvedic tradition it is called Gokshura (also spelled Gokshur); in Traditional Chinese Medicine (TCM) it is known as Bai Ji Li or referred to colloquially as "hard thorns" and "goat head." In Traditional Iranian medicine it is called Khara.

Plant parts used: The plant is year-round flowering and every part has different therapeutic uses. Its fruit is considered a tonic diuretic and aphrodisiac offering remedies for urinary diseases, impotence, and heart disease; its seeds are recommended for bleeding, kidney stones, and gout; and its roots have demonstrated cardiotonic properties.

Pharmacopeial recognition: The fruits are used in TCM, in Ayurvedic medicine in India, and traditional medicine in Bulgaria for the treatment of different conditions. The fruits have monographs in the Japanese Pharmacopoeia 16th Ed. (2012), Korean Pharmacopoeia 9th Ed. (2007), Pharmacopoeia of China (2005), and Siddha Pharmacopoeia India, Vol. 1 (2008).

Geographical variation in phytochemical composition: Studies have revealed that the composition of T. terrestris is strictly linked with the origin of the plant, and hence with climatic conditions, as geographical regions significantly influence the composition of herbal drugs. The saponin composition and content of T. terrestris vary across different geographic regions. This has major implications for the reproducibility and comparability of research studies and commercial products.

2. Common Preparations and Dosage Forms

Products and preparations manufactured from the aboveground plant parts are especially popular among athletes and people with health issues and diseases such as hormonal imbalance, sexual problems, heart problems, and various kidney and skin diseases.

Commercial preparations of T. terrestris are available in several forms:

• Standardized extracts in capsule or tablet form: These are the dominant commercial format and are most commonly standardized to either total saponin content or, more specifically, to protodioscin content. Protodioscin is the dominant component in TT fruits and is considered to be the main pharmacologically active steroidal saponin.
• Dried whole fruit and root powders, often encapsulated.
• Hydroalcoholic (aqueous-ethanol) extracts, used both in research contexts and in traditional preparations. The double-blind randomized clinical trial by Samani et al. (2016), for instance, used a hydroalcoholic extract at 1,000 mg/day administered for three months.
• Traditional decoctions and infusions: fruit or root material boiled in water for oral administration, a form used in folk medicine across multiple traditions.

Dosages used in clinical studies: Doses across human trials have varied substantially. Tribulus terrestris supplementation at doses of 400 to 750 mg/day for 1 to 3 months was assessed in studies examining erectile dysfunction. In the CrossFit study by Fernández-Lázaro et al. (2021), a total of 30 healthy CrossFit-trained males were allocated to receive either 770 mg of TT supplementation or a placebo daily for 6 weeks. In the diabetes trial by Samani et al., participants received 1,000 mg/day for three months. The 2025 systematic review on erectile dysfunction and testosterone identified studies using 15 to 172 participants (total = 483) aged between 16 and 70 years with different health conditions.

Standardization: The most scientifically relevant form of standardization targets protodioscin concentration. Commercial extracts vary widely — commonly from approximately 20% to 40% protodioscin of total extract weight — but this standardization is not universally applied and many products on the market specify only total saponin percentage (often cited as 40–90% total saponins), which does not reliably reflect protodioscin content. Phytochemical studies have shown great disparities in the content of active substances, in particular the concentration of furostanol and spirostanol saponoside, considered to be the predominant active ingredients.

3. Traditional and Historical Uses

3.1 Ayurvedic Medicine (India)

This potent Ayurvedic medicine has been utilized for centuries in Ayurveda to address venereal disorders and sexual debility. In Ayurveda, the plant is known as Gokshura (meaning "cow's hoof" in Sanskrit, a reference to its spiny fruits). In India, the fruits have been used in the treatment of infertility, impotence, erectile dysfunction, and low libido in Ayurveda. In Ayurveda, T. terrestris is used as a diuretic, aphrodisiac, immunomodulatory, anti-urolithic, antibacterial, anti-hyperlipidemic, antidiabetic, hepatoprotective, anticancer, anti-hypertensive, anthelmintic, analgesic, and anti-inflammatory drug. The plant was classified as a rasayana — a rejuvenating herb believed to promote strength, vitality, and longevity.

3.2 Traditional Chinese Medicine

The fruits and roots of TT have been used as a folk medicine for thousands of years in China, India, Sudan, and Pakistan. In TCM, the dried fruit (Bai Ji Li) is used to smooth the flow of liver-qi, disperse wind-heat, and treat conditions including headache, vertigo, skin itching, and eye disorders. Its uses from ancient times include headache and vertigo, and mammary duct blockage. The plant is also referenced for male impotence and urinary retention in classical Chinese herbal literature.

3.3 Traditional Iranian and Eastern Mediterranean Medicine

In Traditional Iranian medicine — where it is called Khara — it was prescribed for bladder stones and urinary channel disorders. Tribulus terrestris has been traditionally used because of its aphrodisiac and antiurolithiatic activities with almost complete inhibition of stone formation.

3.4 Bulgarian and Eastern European Folk Medicine

In Bulgaria, the plant is used as a traditional remedy for treating impotence. Bulgarian interest in T. terrestris was notably heightened in the twentieth century, when the extract gained attention in Eastern Europe as a performance-enhancing substance reportedly used by Bulgarian weightlifters and athletes, which catalyzed its global popularization as a sports supplement in the 1990s. Bulgarian pharmacological research also established the compound tribestan, a standardized TT extract, which drove further clinical investigation.

3.5 Traditional Use Summary Table

• India (Ayurveda): Sexual debility, infertility, impotence, urinary tract disorders, kidney stones, as a rasayana tonic; preparations include decoctions of fruits and roots.
• China (TCM): Headache, vertigo, eye disorders, liver-qi stagnation, impotence, urinary retention; dried fruit used in decoctions.
• Iran / Persia: Bladder stones, urinary channel disorders; infusions and decoctions.
• Bulgaria / Eastern Europe: Impotence, general vitality; standardized extract (tribestan) developed for clinical use.
• Sudan, Pakistan: General vitality and folk medicinal purposes, primarily using the fruit and root.

4. Key Chemical Constituents and Active Compounds

Many different compounds have been identified in TT including steroidal saponins, flavonoids, glycosides, phytosterols, tannins, terpenoids, amide derivatives, amino acids, and proteins. Among the different types of constituents, steroidal saponins and flavonoids are considered to be the most important metabolites with various bioactivities.

4.1 Steroidal Saponins

Spirostanol and furostanol saponins are considered the most characteristic chemicals in TT. To date, 108 kinds of steroidal saponins have been isolated from TT, among them 58 kinds of spirostane saponins and 50 kinds of furostane saponins.

The basic plant medicinal properties are defined by the presence of steroidal saponins having a furostanol or spirostanol nucleus, glycosylated in the 3 and/or 26 positions with linear and branched glycosidic units; they are specific for the species' chemical composition.

The steroidal saponins primarily consist of furostanol and spirostanol types. It is believed that furostanol saponins serve as biogenetic precursors to their spiro analogs. Furostanol saponins have a characteristic five-membered furan ring attached to the steroid nucleus. The structure of spirostanol saponins features a spiro configuration of rings. These saponins contain glycosidic bonds with various sugar moieties (e.g., glucose, rhamnose) attached to the aglycone part.

Protodioscin is the most studied individual saponin in TT. Protodioscin is a steroidal saponin compound found in a number of plant species, most notably in the Tribulus, Trigonella, Dioscorea, and Trillium families, and is best known as the putative active component of the herbal aphrodisiac plant Tribulus terrestris. The steroidal saponins, such as protodioscin and protogracillin, are thought to confer TT its unique biological activities.

4.2 Flavonoids

The most significant bioactive components in TT are flavonoids (quercetin, kaempferol, and isorhamnetin) and steroidal saponins. UPLC-EIS/MS analysis of TT has identified flavonoids and saponins including epigallocatechin, kaempferol, rutin, quercetin, luteolin, apigetrin, cynaroside, caffeic acid, trillin, trillarin, hecogenin, terreside B, protodioscin, and saponin C.

4.3 Alkaloids

Several groups of natural products in TT have been established: steroids, saponins, flavonoids, sterols, Harman alkaloids, minerals, lignan amides, and cinnamic acid amides. The Harman-type β-carboline alkaloids are a notable alkaloid class present in the plant.

4.4 Lignan Amides and Cinnamic Acid Derivatives

Li et al. isolated tribulusamides A and B, lignan amides, in TT fruits; these compounds protect cells in the presence of tumors induced by D-galactosamine/TNF-α. Ren et al. and Jain and Gupta identified new derivatives of the cinnamic acid amides in fruits: terrestriamide (I) and 7-methylhydroindanone-1 (II).

4.5 Phytosterols

Sterols in the above-ground parts are presented by sitosterol, stigmasterol, and campesterol. Petkov examined Bulgarian samples of TT and reported a group of sterols typical for plants.

5. Mechanisms of Action

5.1 Proposed Androgenic / Gonadotropic Mechanism

The steroidal saponins (gitonin, protodioscin, and tribulosaponins A and B) present in TT are proposed to have an effect on androgen receptors in the brain, causing an underestimation of sex hormone levels, which causes the posterior pituitary gland to secrete more LH and, as a consequence, increased testosterone synthesis in the testes. It is believed that T. terrestris can enhance testosterone levels by stimulating the release of gonadotropin-releasing hormone (GnRH), which in turn triggers the production of follicle-stimulating hormone (FSH) and luteinizing hormone (LH).

Additionally, protodioscin in particular is believed to increase the conversion of testosterone to dihydrotestosterone, which promotes red blood cell production and muscle development. Extracts of T. terrestris standardized for protodioscin content have been shown to produce proerectile effects in isolated tissues and aphrodisiac activity in several animal models. Protodioscin is thought to contribute to increased androgen receptor immunoreactivity in some tissues, likely as a secondary effect of elevated levels of endogenous androgens such as testosterone and dihydrotestosterone (DHT).

It is important to note that this mechanism remains incompletely verified in humans. Despite multiple in vivo studies with TT, very little is known about the pharmacokinetics of the therapeutically active compounds.

5.2 Diuretic and Urinary Effects

An aqueous extract of Tribulus terrestris was observed to exert a diuretic effect and increase urinary sodium and chloride concentrations.

5.3 Antioxidant and Anti-inflammatory Effects

T. terrestris contains various bioactive metabolites including steroidal saponins, flavonoids, and alkaloids, which exhibit anti-inflammatory, antioxidant, and antibacterial properties, and tyrosinase-regulating effects. Steroidal saponins find wide application in the pharmaceutical industry due to their reported association with sex hormones, cortisone, diuretic steroids, vitamin D, and cardioglycosides.

5.4 Antidiabetic / Glucose-modulating Effects

In animal and in vitro studies, TT extracts have shown α-glucosidase inhibitory activity and antidiabetic effects. In a rat model of diabetes, both low- and high-protodioscin-content TT preparations reduced elevated blood glucose levels. Insulin and luteinizing hormone levels were not significantly different compared with control, but FSH and testosterone levels were significantly higher in the high-protodioscin-content group. The testosterone level was correlated in part with protodioscin concentration in extracts and is probably mediated through an FSH-linked pathway.

5.5 Cardiovascular / ACE Inhibitory Effects

Somanadhan et al. (1999) reported that Tribulus terrestris showed 56% ACE inhibitory activity. This has been proposed as a potential mechanism underlying its traditional use for blood pressure regulation, though human data are limited.

6. Scientific Evidence by Area of Use

6.1 Testosterone Levels and Male Androgen Profile

The claim that TT supplementation raises serum testosterone is among the most widely marketed but also among the most contested in the literature.

After searching 162 records, a 2025 systematic review (PRISMA-compliant) selected 10 studies for eligibility, comprising 9 clinical trials and 1 quasi-experimental study; the Jadad score revealed low methodological quality for 50% of the studies.

TT supplementation at doses of 400 to 750 mg/day for 1 to 3 months improved erectile dysfunction in 3 of the 5 studies that assessed this parameter. Eight out of ten studies did not report significant changes in androgen profile following TT supplementation, but the subjects in the neutral studies did not have low androgen levels at baseline. Only 2 studies showed significant intra-group increase in total testosterone levels, which had low clinical magnitude (60–70 ng/dL) and involved subjects with hypogonadism. The conclusion was that TT supplementation has a low level of evidence regarding its effectiveness in improving erectile function in men with erectile dysfunction, and no robust evidence was found for increasing testosterone levels.

TT has no significant influence on serum testosterone concentrations, strength, lean body mass, and exercise performance in elite rugby league players, resistance-trained males, and normal females, as well as in intact and castrated rats. These findings are consistent across multiple well-controlled studies in healthy eugonadal men. The totality of evidence suggests that TT may have a modest effect on testosterone in specific populations (e.g., hypogonadal men) but does not appear to meaningfully elevate testosterone in healthy individuals with normal baseline androgen levels.

6.2 Erectile Dysfunction

Several randomized controlled trials have investigated TT for erectile dysfunction (ED). Although a couple of studies report efficacy of TT supplementation on the androgen profile and sexual function of men with infertility, ED, and older men, other evidence indicates that TT supplementation is not effective for these purposes. As noted above, only 3 of 5 studies in the 2025 systematic review demonstrated improvement in erectile function at doses of 400–750 mg/day, and the overall evidence level was rated as low. Methodological limitations including small sample sizes, short durations, and heterogeneous populations constrain firm conclusions.

6.3 Female Sexual Dysfunction

A systematic review specifically addressing TT for female sexual dysfunction found preliminary signal but very weak evidence overall. After 1 to 3 months of treatment, premenopausal and postmenopausal women randomized to T. terrestris had a significant increase in sexual function scores. Three months of treatment with T. terrestris showed a significant increase in serum testosterone levels of premenopausal women. However, the certainty of the evidence is very low for sexual dysfunction and adverse events after 1 and 3 months of treatment; the reasons to downgrade the evidence were the risk of bias of the trials and imprecision due to small sample sizes. More RCTs are needed to support or refute the use of T. terrestris for female sexual dysfunction.

6.4 Male Infertility and Sperm Parameters

A systematic review by Sanagoo et al. reported the improvement of sperm parameters in men with idiopathic infertility following tribulus administration. This suggests that TT may have a more consistent effect in the context of sub-fertility than in healthy eugonadal men. Evidence quality here remains moderate at best, given the small number and size of trials.

6.5 Athletic Performance and Body Composition

TT has been aggressively marketed to athletes as an anabolic and ergogenic aid. The scientific evidence, however, does not broadly support these claims.

Tribulus terrestris supplementation did not have any effect on body composition, aerobic performance, or muscle strength in one study; four weeks of TT supplementation failed to improve exercise performance and body composition following a detraining period.

In a randomized, single-blind, placebo-controlled trial, 30 healthy CrossFit-trained males received either 770 mg of TT supplementation or placebo daily for 6 weeks; body mass, fat mass, fat composition, testosterone and cortisol levels, and CrossFit performance were assessed. There were no significant group × time interactions for the outcomes of the study except for testosterone levels and bench press performance (p < 0.05). The isolated finding for bench press has not been replicated across multiple outcomes, and the single-blind design represents a methodological limitation.

TT is used in traditional Chinese medicine, Ayurvedic medicine, and sports nutrition to improve health and performance; however, no conclusive evidence exists about the potential beneficial effects of TT on sport and health biomarkers in physically active adults. A 2022 systematic review of physically active adult males found only 7 studies meeting inclusion criteria out of 340 records identified, underscoring the scarcity of high-quality evidence. More clinical trials are needed to obtain honest evidence on the efficacy of TT for athletic performance.

6.6 Blood Glucose and Metabolic Parameters

One notable double-blind, randomized, placebo-controlled trial examined TT in diabetic women. Considering the folkloric use of Tribulus terrestris in diabetes and proven anti-hyperglycemic and anti-hyperlipidemic effects in animal studies, 98 diabetic women were randomly allocated to receive either T. terrestris (1,000 mg/day) or placebo for three months and were evaluated for fasting blood glucose, 2-hour postprandial glucose, glycosylated hemoglobin, and lipid profile. T. terrestris showed a significant blood glucose-lowering effect in diabetic women compared to placebo (P<0.05). Also, the total cholesterol and low-density lipoprotein of the T. terrestris group were significantly reduced compared with placebo, while no significant effect was observed in triglyceride and high-density lipoprotein levels. This study showed a preliminary promising hypoglycemic effect of T. terrestris in diabetic women. This trial is a single-center study with baseline imbalances and requires replication before firm conclusions can be drawn.

6.7 Urinary and Renal Health (Antiurolithic Activity)

Both traditional use and preclinical data suggest a role for TT in urinary health. The plant's diuretic properties and traditional use for urolithiasis (kidney stones) have some support from animal experiments, but robust human clinical trials in this area are lacking. In traditional use, the fruit is considered a tonic diuretic and aphrodisiac offering remedies for urinary diseases.

6.8 Skin and Dermatological Uses

T. terrestris has garnered increasing attention for its potential in treating skin diseases. It contains various bioactive metabolites including steroidal saponins, flavonoids, and alkaloids that exhibit anti-inflammatory, antioxidant, antibacterial properties, and tyrosinase-regulating effects, making it a promising candidate for treating multiple skin disorders. Studies have shown its potential efficacy against conditions such as atopic dermatitis, acne, and vitiligo. However, several limitations remain: its precise mechanisms of action in skin diseases are not yet fully elucidated, its standalone efficacy for complex skin diseases may be limited, and there is a lack of high-quality, large-scale clinical trials to conclusively verify its efficacy and safety.

6.9 Cardiovascular and Cardioprotective Effects

Preclinical data have suggested potential cardioprotective properties via ACE inhibition and antioxidant pathways. The roots have demonstrated cardiotonic properties in pharmacological studies. However, no large-scale, well-controlled human trials exist to establish clinical efficacy for cardiovascular outcomes. Evidence in this area remains preclinical and preliminary.

Summary of Evidence Strength

• Testosterone elevation in healthy men: Evidence is predominantly negative in well-controlled trials. No robust human evidence.
• Erectile dysfunction: Mixed evidence; low-quality evidence of modest benefit in men with ED; no benefit established in healthy eugonadal men.
• Female sexual dysfunction: Preliminary signal; very low certainty of evidence.
• Male infertility / sperm parameters: Some supportive evidence in men with idiopathic infertility; limited by trial quality and size.
• Athletic performance / body composition: No consistent evidence of benefit in controlled trials.
• Blood glucose (type 2 diabetes): One positive RCT; requires replication; preliminary.
• Urolithiasis / urinary tract: Traditional use with preclinical support; human clinical evidence largely absent.
• Skin disease: Preclinical and early-stage evidence only; no high-quality clinical trials.

7. Body Systems Associated with Tribulus terrestris

T. terrestris is used in various traditional medical practices — including Ayurveda, TCM, and Siddha — as a diuretic, aphrodisiac, immunomodulatory, anti-urolithic, antibacterial, anti-hyperlipidemic, antidiabetic, hepatoprotective, anticancer, anti-hypertensive, anthelmintic, analgesic, and anti-inflammatory agent. Across the available literature, the following body systems are most frequently associated with its study or use:

• Reproductive and sexual systems: The dominant area of research and traditional use. Encompasses male and female libido, erectile function, sperm quality, and hormonal balance (testosterone, LH, FSH).
• Urinary / renal system: Diuretic effects, antiurolithic (kidney stone) activity, and support of urinary tract health.
• Musculoskeletal / performance: Proposed ergogenic and anabolic effects in athletes, though not substantiated by the balance of evidence.
• Metabolic / endocrine system: Blood glucose regulation, lipid profile modification, potential antidiabetic activity.
• Cardiovascular system: ACE inhibition, cardiotonic effects attributed to roots, antioxidant activity.
• Integumentary system (skin): Anti-inflammatory and antioxidant effects applied to atopic dermatitis, acne, and vitiligo.
• Immune system: Immunomodulatory activity proposed based on preclinical research.

8. Safety Considerations and Drug Interactions

While T. terrestris is widely marketed as safe, case reports and toxicological studies indicate that serious adverse events can occur, particularly at high doses or with specific product preparations.

8.1 Nephrotoxicity

A 28-year-old man reported a severe case of nephrotoxicity after consuming Tribulus juice. Another case of reported toxicity resulting from the use of Tribulus terrestris supplements involved a 30-year-old man who was diagnosed with acute tubular necrosis. A case of TT-induced hepatotoxicity, nephrotoxicity, and neurotoxicity was reported in an Iranian male patient who used the plant's extract to prevent kidney stone formation; he presented with seizure and very high serum aminotransferases and creatinine after consuming herbal water for 2 days. Discontinuation of the herbal remedy resulted in improvement in symptoms and normalization of liver enzymes. There are also 2 documented reports of severe nephrotoxicity from acute tubular necrosis contributed to by use of Tribulus terrestris in young male patients.

8.2 Rhabdomyolysis and Statin Interaction

A case of rhabdomyolysis was documented in association with combined use of Tribulus terrestris and atorvastatin; a 71-year-old man presented to the Emergency Department in rhabdomyolysis with mild transaminitis after taking the over-the-counter supplement while on long-term atorvastatin. This case is particularly important because statins are one of the most widely prescribed drug classes globally, and this interaction—while representing a single case report—warrants clinical attention.

8.3 Gastrointestinal Effects

Due to the saponin content of the plant, gastrointestinal disturbances may be seen in sensitive individuals. Nausea, cramping, and stomach upset are among the most commonly reported mild adverse effects in clinical trials.

8.4 Other Reported Adverse Effects

A reported rare side effect is gynecomastia. In addition, excitation, menorrhagia, and insomnia were reported in a clinical study.

8.5 Hepatotoxicity

Of particular relevance is hepatotoxicity, nephrotoxicity, and neurotoxicity, although fortunately the effects were reversible once intake was discontinued. Ryan et al. (2015) confirmed nephrotoxicity secondary to cholestasis and hyperbilirubinemia from Tribulus terrestris in a young patient who took two tablets daily for several months.

8.6 In Vitro Toxicological Concerns

Other recent in vitro studies have also indicated cytotoxicity as well as genotoxic and estrogenic activity from Tribulus terrestris extracts. Saponins, due to their amphiphilic molecular nature, have membrane permeabilizing properties, and they could increase the absorption of other compounds; this property is of great importance because toxic effects could appear in patients with multiple conditions.

8.7 Animal Toxicity

Previous reports — particularly in animal models and high-dose supplementation trials — have suggested potential side effects such as hepatotoxicity, nephrotoxicity, or hormonal imbalances when administered chronically or at pharmacological concentrations.

8.8 Product Quality and Variability

A significant and underappreciated safety issue is the wide variability in the quality and composition of commercial T. terrestris products. The saponin composition and content of T. terrestris vary across different geographic regions, and because standardization is inconsistent across the supplement industry, the actual content of pharmacologically active constituents in any given product may differ substantially from label claims. This also makes direct comparison of clinical study results difficult.

8.9 Populations Requiring Caution

Based on available case reports and preclinical data, particular caution is warranted in:

• Individuals taking statins (rhabdomyolysis risk, as per published case report).
• Individuals with pre-existing renal impairment (nephrotoxicity risk).
• Individuals with pre-existing hepatic disease (hepatotoxicity risk from high-dose or prolonged use).
• Pregnant or lactating women (effects on hormonal physiology; in vitro estrogenic activity noted).
• Individuals taking antihypertensive agents (potential additive hypotensive effect via ACE inhibitory activity).
• Individuals taking antidiabetic medications (potential additive hypoglycemic effect).

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