Senos (hinchazón y sensibilidad)

Procyanidin B2, a dimeric proanthocyanidin found in high concentration in apple peel, has demonstrated hair growth stimulation in human clinical trials via both topical and oral administration. Annurca apple (Malus pumila Miller cv. Annurca) polyphenolic extracts have shown significant increases in hair growth, number, weight, and keratin content in human subjects.

Multiple preclinical studies—both in vitro (human follicle dermal papilla cells) and in vivo (mouse models of androgenetic alopecia)—demonstrate that T. bellirica extracts counter testosterone-induced hair growth regression, inhibit type II 5α-reductase (rate comparable to finasteride), and activate MAPK signaling pathways to remodel the follicular microenvironment. Seed oil use as a hair tonic is additionally documented in classical Ayurvedic texts.

Beta-sitosterol is a phytosterol that inhibits 5-alpha-reductase, reducing DHT production in scalp tissue. It is the proposed active constituent behind saw palmetto and pumpkin seed oil's anti-androgenic effects on hair follicles. A small controlled trial found beta-sitosterol combined with saw palmetto increased the proportion of subjects with improved hair growth vs. placebo in male androgenetic alopecia.

Bovine liver is a top food source of biotin, which is required for keratin synthesis and hair follicle function; deficiency causes hair thinning and alopecia. It also provides iron (deficiency is a cause of diffuse hair loss), copper (required for melanin and follicle integrity), and vitamin A (required for sebum production and follicle cell differentiation).

Catalase maintains hair follicle redox balance by clearing H₂O₂, which if left to accumulate damages follicular melanocytes and disrupts normal hair cycling. Reduced catalase activity is associated with follicular oxidative stress that can impair both pigmentation and the anagen (growth) phase of the hair cycle.

Virgin coconut oil penetrates the hair shaft more deeply than most oils, reducing protein loss and hair breakage. It also contributes to managing hair loss via antimicrobial, anti-inflammatory, and antioxidant activity on the scalp. Human evidence includes controlled studies showing reduced hair breakage and improved conditioning, though large RCTs on regrowth are limited.

Oral collagen peptides provide amino acid substrates (notably proline, glycine, and hydroxyproline) that support keratin synthesis and dermal matrix integrity around follicles. A 2023 randomized controlled trial using marine hydrolyzed collagen combined with amino acids, iron, and selenium improved clinical outcomes in AGA and telogen effluvium patients. A 2022 study found fish-derived collagen peptides promoted human dermal papilla cell proliferation and stimulated hair regrowth in mice.

Copper is required for tyrosinase activity (melanin production in hair) and for lysyl oxidase-mediated cross-linking of keratin structural proteins. Deficiency leads to hypopigmentation, hair brittleness, and structural weakness. GHK-Cu peptide has shown hair follicle support in models. Human studies on supplementation for hair growth are limited but deficiency effects are well documented.

Eclipta prostrata (Eclipta alba, bhringraj) is used in Ayurvedic medicine as the 'King of Hair' for strengthening follicles and promoting hair growth. Scientific evidence includes animal studies showing it prolongs the anagen phase, comparable to or exceeding minoxidil, and in vitro data showing FGF-7 upregulation and mTOR activation in human dermal papilla cells. Active constituents include wedelolactone, ecliptine, and luteolin.

EGCG promotes hair follicle growth by stimulating proliferation of dermal papilla cells and outer root sheath cells via Sonic Hedgehog (Shh) and AKT signaling pathways. It also inhibits 5α-reductase, the enzyme that converts testosterone to DHT, a key driver of androgenic alopecia.

A randomized, placebo-controlled clinical trial of a fenugreek-seed-containing food supplement demonstrated successful treatment of low-to-moderate hair loss and improvement in hair growth in both men and women. Fenugreek's phytoestrogenic and protein-rich profile is proposed to nourish hair follicles.

Ginseng (primarily Panax ginseng) has been studied for hair growth promotion in vitro, in animal models, and in limited human data. Ginsenosides promote hair follicle cell viability, inhibit apoptosis in dermal papilla cells, and extend the anagen phase. A 2015 PMC study found red ginseng extract promoted anagen maintenance in cultured human hair follicles.

A 2024 clinical study found that women with hair loss who took amla syrup daily showed significant improvement in hair growth and thickness. Traditional Ayurvedic use of amla for hair is extensive, including in Chyawanprash and amla oil.

Hibiscus rosa-sinensis leaf and flower extracts have demonstrated significant hair growth promotion in preclinical models, reducing telogen phase and increasing anagen hair follicles. Traditional Ayurvedic and South Asian use for hair care is well-documented. Human clinical trials are lacking but preclinical evidence is consistent.

Thyroid hormones, synthesised using iodine, are required for normal hair follicle cycling and maintenance. Both iodine deficiency-induced hypothyroidism and iodine excess-induced hyperthyroidism can lead to telogen effluvium, resulting in diffuse hair thinning. Correcting the underlying thyroid dysfunction restores hair growth. The relationship is mediated through thyroid status rather than direct iodine action on the follicle.

Iron deficiency is a well-established modifiable risk factor for hair loss, including telogen effluvium, androgenetic alopecia, and alopecia areata. Iron carries oxygen to hair follicle cells; deficiency impairs the rapidly dividing follicular matrix. Correcting iron deficiency through supplementation in documented deficient patients has shown benefit in hair loss outcomes across multiple studies.

Multiple randomized, placebo-controlled trials have evaluated oral keratin hydrolysate supplements for hair outcomes. A double-blind RCT using the hydrolyzed keratin ingredient Kera-Diet (KeraGLO) in 99 women aged 35–65 found significant improvements in hair gloss and structural parameters vs. placebo over 90 days. A separate placebo-controlled trial of KeraGEN IV (solubilized keratin) reported significant reductions in hair loss and improvements in hair strength over 60 days. Keratin is a major structural protein of the hair cortex, and hydrolysates are theorized to replenish cortical proteins and reduce fiber breakage.

L-cysteine is a sulfur-containing amino acid and a rate-limiting substrate for keratin synthesis; hair is approximately 14% cysteine by weight. Oral L-cysteine supplementation has been evaluated in controlled trials for hair loss, with evidence supporting benefit particularly in combination with other amino acids and vitamins. A 6-month RCT using an L-cystine/saw palmetto/biotin combination showed significant increases in hair volume for both AGA and telogen effluvium.

L-cystine (the oxidized dimer of cysteine) is a key substrate for keratin production and has been specifically studied in hair loss formulas. A clinical study using a supplement containing L-cystine, saw palmetto, and biotin showed significant hair volume increases in androgenetic alopecia and telogen effluvium patients over 6 months. German Commission E and pharmaceutical-grade preparations (e.g., Pantovigar) have included L-cystine for hair loss.

L-lysine is an essential amino acid that plays a structural role in hair keratin and facilitates iron absorption—iron being a critical factor in follicular cycling. Studies have found that iron supplementation combined with L-lysine is more effective than iron alone in treating chronic telogen effluvium. Lysine deficiency has been documented in women with diffuse hair loss.

L-methionine is a sulfur-containing essential amino acid that provides methyl groups and sulfur for keratin biosynthesis and supports cysteine production via the transsulfuration pathway. It is included in European pharmaceutical hair formulas and has been tested in combination clinical trials for androgenetic alopecia and telogen effluvium.

LA regulates hair growth-related signaling pathways, including Wnt/β-catenin, in dermal papilla cells (DPCs), promoting cell cycle progression and growth factor secretion in preclinical research. A PMC study found LA isolated from Malva verticillata seeds activated Wnt/β-catenin signaling to stimulate DPC proliferation. Reviews confirm hair growth stimulation as a documented biological activity of topical LA.

A randomized double-blind controlled trial (Hay et al., Archives of Dermatology) using a blend of essential oils including lavender applied with daily scalp massage showed significant improvement in alopecia areata (44% vs 15% in controls). Preclinical mouse studies indicate topical lavender oil can promote anagen-associated histologic changes. Direct evidence for lavender as a standalone hair growth agent in humans is limited.

Millet seed oil (MSO) contains miliacin (a phytosterol) shown in clinical trials to reduce telogen-phase hair density and improve scalp conditions. In a C57BL/6 mouse model of testosterone-induced alopecia, oral MSO stimulated hair growth by activating the β-catenin/Wnt pathway. MSO also promotes dermal papilla cell proliferation in human cell cultures.

MSM is an organosulfur compound that provides bioavailable sulfur for keratin disulfide bond formation in hair shafts. Preliminary clinical evidence suggests that MSM at 3 g/day combined with magnesium ascorbyl phosphate improves hair length and thickness compared to the comparator alone at 6 months. Mechanistically, MSM also reduces follicle-damaging inflammation.

Omega-3 fatty acids (EPA and DHA) reduce follicular inflammation, support cell membrane integrity in hair follicle cells, and nourish scalp tissue. A 6-month randomized controlled trial using an omega-3/6 supplement showed significant improvements in hair density and reduced hair loss in women with androgenetic alopecia. Omega-3 fatty acids are identified in systematic reviews as nutraceuticals with modest clinical evidence for hair improvement.

Linoleic acid (LA), the predominant dietary omega-6 PUFA, promotes expression of factors responsible for hair growth through its conversion to arachidonic acid and its role in regulating hair follicle growth pathways. LA-rich vegetable oils (safflower, argan) have shown hair growth-promoting effects, and LA deficiency is associated with hair loss. Evidence is primarily from mechanistic and preclinical studies with limited human RCTs.

P. orientalis leaf extract has demonstrated hair growth-promoting activity in human dermal papilla cell (hDPC) culture models and in vivo mouse studies via multiple mechanisms including ACK1 tyrosine kinase activation, upregulation of growth factors (bFGF, KGF, VEGF), and reduction of cellular senescence markers. Multiple peer-reviewed studies in this area have been published. TCM also recognizes the plant as a hair-growth and hair-darkening herb.

Panthenol (pro-vitamin B5/dexpanthenol) penetrates the scalp and is converted to pantothenic acid in follicle cells, supporting energy metabolism for rapid hair matrix cell division. It is used topically in hair serums and clinically in European pharmaceutical hair formulas. Patent-backed studies document improved hair density and reduced brittleness with topical panthenol application.

A 2014 controlled animal study (Toxicological Research) found that topical 3% peppermint oil promoted hair growth superior to 3% minoxidil in mice, attributed to increased vascularization of hair dermal papilla. Human clinical trials are lacking; evidence is currently limited to a well-designed animal study. A 2025 in vitro and mouse study on a peppermint-mastic gum mixture also supported hair growth promotion.

Specific hair-regrowth compounds — polyporusterones A and B, acetosyringone, and 3,4-dihydroxybenzaldehyde — have been isolated from P. umbellatus. Mouse and human scalp follicle organ-culture studies confirm dose-dependent hair growth promotion at low concentrations.

Pumpkin seed oil has been studied specifically for androgenetic alopecia. A 2014 randomized, double-blind, placebo-controlled trial found 400 mg/day of pumpkin seed oil over 24 weeks significantly increased hair count in men with AGA compared to placebo. Its proposed mechanism involves inhibition of 5-alpha-reductase and DHT activity at the follicle.

Pygeum africanum bark extract has demonstrated anti-androgenic and anti-inflammatory effects relevant to androgenetic alopecia. It inhibits DHT binding to follicular receptors and reduces scalp inflammation, complementing saw palmetto and pumpkin seed oil. Trichology sources categorize Pygeum among the best-supported DHT-targeting natural options for androgenetic alopecia.

Preliminary evidence suggests red clover isoflavones may support hair growth by extending the anagen (growth) phase of the hair cycle, increasing dermal papilla growth factors, and stabilizing the extracellular matrix. One clinical observation reported improved scalp, hair, and skin health in adult women within 90 days. Evidence remains limited and primarily mechanistic.

Rosemary oil has been tested in clinical trials against minoxidil for androgenetic alopecia and in RCTs assessing hair growth, thickness, and density. A 2015 randomized trial found topical rosemary oil comparable to 2% minoxidil for hair count at 6 months in male AGA. A 2025 RCT demonstrated rosemary-based oils significantly improved hair growth rate, thickness, density, and reduced hair fall vs. coconut oil control (p<0.0001).

Saw palmetto (Serenoa repens) inhibits 5-alpha-reductase, reducing conversion of testosterone to DHT, a key driver of androgenetic alopecia (AGA). A systematic review of 5 RCTs and 2 prospective cohort studies found significant improvements in hair quality, count, and density. In one RCT, 320 mg/day outperformed placebo with 38% of patients showing improvement at 2 years, though it was inferior to finasteride 1 mg.

Selenium is an essential trace mineral incorporated into selenoproteins including glutathione peroxidase, which protects hair follicle cells from oxidative stress. Both deficiency and excess cause hair loss. Correcting deficiency restores hair growth; selenium is included in clinical combination supplements for androgenetic alopecia and telogen effluvium.

Selenomethionine is the primary organic form of selenium with superior bioavailability compared to inorganic selenium salts. It supports hair follicle selenoprotein synthesis (glutathione peroxidase), protecting follicle cells from oxidative stress. It is the preferred supplemental selenium form included in clinical hair supplement trials.

Clinical evidence shows silicon supplementation can improve hair strand strength and thickness in women with fine hair. A randomized trial of 10 mg Si/day for 9 months in 48 women with fine hair reported significantly stronger, thicker hair strands in the silicon group. The mechanism involves silicon's role in collagen synthesis and structural integrity of the hair shaft.

The same randomized controlled trial that demonstrated tocotrienols' effect on hair loss showed a 34.5% increase in hair number in treated volunteers. While hair count increased significantly, strand weight was not significantly different, indicating the main effect is on hair follicle activation rather than shaft thickness.

Vitamin A (retinol and its derivatives) is essential for hair follicle cell differentiation and sebum production; both deficiency and excess cause telogen effluvium and hair loss. Correcting deficiency restores normal follicular cycling. The evidence is primarily deficiency-based, with toxicity at high doses a recognized risk.

Pantothenic acid (vitamin B5) is essential for coenzyme A biosynthesis, which supports fatty acid metabolism in hair follicle matrix cells. European pharmaceutical hair-loss formulas (e.g., Pantovigar, containing calcium pantothenate/pantothenic acid) are approved and widely used for diffuse hair loss. Deficiency causes telogen effluvium; supplementation in deficiency states restores normal follicle cycling.

Biotin is a cofactor in keratin gene expression and is widely used for hair growth support. Clinical evidence is strongest in cases of documented deficiency or specific pediatric hair disorders (e.g., uncombable hair syndrome, short anagen syndrome), where doses of 300 mcg–5,000 mcg/day improved hair thickness and combability. High-quality controlled trials in unselected adults do not consistently show benefit in biotin-sufficient individuals.

Vitamin C is essential for collagen synthesis in the follicular dermal sheath, enhances non-heme iron absorption (critical for hair follicle cycling), and protects against oxidative stress in scalp tissue. Insufficiency results in hair shaft abnormalities (corkscrew hairs) and hair breakage. It is consistently included in combination hair-loss clinical trials as a cofactor.

Vitamin D and its receptor (VDR) are expressed in hair follicles and play a role in follicular cycling. Deficiency of vitamin D is associated with androgenetic alopecia, alopecia areata, and telogen effluvium across numerous studies. A 2022 RCT found oral vitamin D supplementation combined with topical minoxidil yielded better results than either treatment alone in female pattern hair loss.

Vitamin D3 (cholecalciferol) is the active supplemental form linked to hair follicle cycling via VDR signaling in dermal papilla and keratinocytes. Deficiency is associated with multiple forms of alopecia, and correcting deficiency supports hair follicle anagen initiation. Clinical evidence parallels that of vitamin D, as D3 is the predominant supplement form studied.

Vitamin E, particularly tocotrienols, has been studied in a randomized double-blind placebo-controlled trial for alopecia. A 2010 RCT found tocotrienol supplementation (100 mg/day) for 8 months significantly increased hair count by 34.5% compared to placebo, attributed to antioxidant protection of hair follicles from oxidative stress. Alpha-tocopherol alone shows weaker evidence.

Zinc deficiency is consistently associated with alopecia areata and telogen effluvium, with lower serum zinc levels found in multiple patient cohorts. Zinc contributes to protein synthesis, 5-alpha-reductase inhibition, and cell proliferation in hair follicles. Evidence for supplementation is strongest in documented deficiency states; supplementation in zinc-sufficient individuals lacks robust support.

Argan oil has traditional Moroccan use for hair care and growth. A 2020 study in the International Journal of Trichology found it reduced hair protein loss and improved elasticity. One review found no meaningful evidence for hair growth specifically; another noted argan extract may stimulate follicle cell growth.

Ashwagandha (Withania somnifera) is proposed to support hair growth indirectly by reducing cortisol levels (high cortisol is linked to telogen effluvium) and potentially enhancing scalp blood flow. Studies confirm it reduces stress and cortisol; the proposed connection to hair growth via stress modulation has mechanistic plausibility. Direct RCT evidence for hair growth outcomes is lacking.

Bamboo's silica content is traditionally and commercially linked to hair growth, thickness, and luster. Silicon strengthens the hair shaft through its role in connective tissue and protein cross-linking. Western herbal texts from the 1990s onward list bamboo pith powder as a natural silica source for hair health, and Indian Ayurvedic/Unani medicine (vanshlochan/tabasheer) includes bamboo for hair loss.

Birch leaves and birch sap have a documented traditional use for promoting hair growth and strengthening hair. The antimicrobial and anti-inflammatory properties of birch constituents provide mechanistic plausibility for scalp health. No controlled clinical trials specifically examining birch for hair growth promotion in humans have been identified.

Vitamin A derived from carrot beta-carotene regulates hair follicle cycling and sebum production. Severe vitamin A deficiency causes hair loss, and traditional use of carrot for hair health is rooted in this provitamin A relationship. Direct clinical evidence from carrot-specific trials for hair growth is absent.

Chinese fleeceflower (Polygonum multiflorum / He Shou Wu) has been used for centuries in Traditional Chinese Medicine (TCM) to nourish the liver and kidney, organs considered central to hair growth and pigmentation in TCM theory. Its use for preventing premature graying and hair thinning is documented in classical Chinese medical texts. Scientific evidence remains preliminary, largely from in vitro and animal studies.

Fo-ti (Polygonum multiflorum) is the same plant as Chinese fleeceflower, widely used in TCM for hair-related conditions including premature graying and thinning for centuries. Modern research confirms in vitro and animal evidence of hair follicle stimulation, but human RCT evidence is lacking. It is used alongside other TCM herbs in combination hair formulas.

Geranium EO is used in traditional aromatherapy for scalp and hair health, based on its circulation-stimulating and sebum-balancing properties. Dandruff and scalp conditions are addressed through its antifungal and antimicrobial actions. No clinical hair-growth trials have been conducted.

Gotu Kola (Centella asiatica) has been used in Ayurvedic and traditional Asian medicine for scalp and hair conditions. Its active triterpenes (asiaticoside, madecassoside) stimulate collagen synthesis, improve scalp microcirculation, and have antioxidant properties. These mechanisms support follicular health, though direct human RCT evidence for hair growth endpoints is limited.

Horsetail (Equisetum arvense) is the highest natural plant source of silica, a mineral shown in clinical studies to improve hair shaft cross-sectional area (thickness) and reduce brittleness. A 9-month double-blind RCT of oral orthosilicic acid derived from horsetail-related sources found significantly thicker hair cross-sections vs. placebo in women with fine hair. Traditional use spans centuries in European herbal medicine for hair and nail strengthening.

Indigo leaves are one of the most classically documented Ayurvedic remedies for promoting hair growth and strengthening hair follicles. Preparations such as Neelibhringadi oil are formally recognized in the Ayurvedic Pharmacopoeia. No controlled clinical trials exist specifically for hair growth.

Stinging nettle (Urtica dioica) contains lignans, phytosterols (including beta-sitosterol), and lectins that may inhibit 5-alpha-reductase and DHT binding at follicular receptors, relevant to androgenetic alopecia. It is identified alongside saw palmetto and pumpkin seed oil as one of the best-supported DHT-related natural options by trichology sources. Traditional European use for scalp and hair conditions spans centuries.

PABA (para-aminobenzoic acid) has a longstanding traditional use in nutritional medicine as a component of hair color restoration and prevention of premature graying, with historical claims dating to the 1940s. It was used in early oral formulations for diffuse hair loss; however, high-quality modern RCT evidence for hair growth or thickness specifically is absent. Traditional nutritional medicine documented pigmentation restoration in several early case reports.

Traditional use of safflower for hair includes Korean folk medicine for hair growth, Thai aqueous flower extract as a hair color promoter, and topical oil application for dry and damaged hair. A PMC review (PMC5984022) noted 'considerable rates of recovery in cases suffering from alopecia when treated with hair-restoring preparations based on safflower.' Safflower oil is also used topically for scalp health.

Sunflower oil is traditionally used in hair care to nourish the scalp and enhance hair quality. Its oleic acid, vitamin E, and gamma-linolenic acid content are considered supportive of hair follicle health. This use is documented in traditional cosmetic practice without specific clinical trial evidence for hair growth endpoints.

Brewer's yeast is widely used traditionally for hair health, attributed to its biotin (B7), zinc, and protein content—all essential for keratin synthesis and hair follicle function. Some research suggests S. cerevisiae may benefit hair growth and thickness, though rigorous human clinical trials specifically on yeast supplementation and hair outcomes are absent.