Condition
Hair Growth
Hair growth is the cycle in which follicles in the scalp build new hair, rest, shed it and start again, and it is steered by stem cells and signals within each follicle. Among supplements, TB-500 is the one with reviewed research, and the evidence is very limited: studies found it stimulated follicle stem cells and promoted hair growth in animals. Those studies were small and mostly animal or lab work, so they say little yet about what it might do for people.
Sources: PMID 26083021
- Updated
- How we grade
- 84 studies cited
- Supplements studied
- 0
- Medicines and peptides
- 1
- Graded outcomes
- 1
No supplement studies yetWe haven’t found supplement studies for Hair Growth. The medicines and peptides studied for it are listed below.
Prescription medicines and peptides studied, for context
| Grade | Outcome | Effect | Size | Studies | People | Studies list |
|---|---|---|---|---|---|---|
| Hair Growth Stimulates hair follicle stem cells and promotes hair growth in animal models. Induces hair follicle development via Wnt signaling pathway activation. | Improves (the measure goes up) | Small effect | 4 studies | 40 people | ||
What the published studies found
3 automated readings
Biotin (Vitamin B7): hair growth
The best available review (2024, 3 studies) found little or no difference in hair growth. That review studied people with hair loss. 1 of the 3 studies read agree; 2 found an improvement. The evidence is limited.
3 studies counted of 8 read: 2 reviews and 1 trial (97 people in the trials).
- Systematic review, 2024; 3 studies; people with hair loss: no clear difference (the review the verdict rests on).
no difference between the biotin and placebo groups for hair growth
Biotin for Hair Loss: Teasing Out the Evidence - Systematic review, 2017; 18 studies, 18 people; patients with underlying pathology for poor hair growth: improves. A Review of the Use of Biotin for Hair Loss
- Randomised trial, 2025; 97 people: improves. The Role of Sesbania grandiflora-Derived Biotin and Bambusa arundinacea-Derived Silica Extracts in Promoting Hair, Skin, and Nail Health: A Randomized, Double-Blind, Placebo-Controlled Clinical Study
- Systematic review, 2024; 3 studies; people with hair loss: no clear difference (the review the verdict rests on).
Collagen Peptides: hair growth
The 2 studies read (114 people in all) mostly found an improvement in hair growth. The evidence is limited.
2 studies counted of 7 read: 2 trials (114 people in the trials).
- Randomised trial, 2026; 114 people; women aged 20-50 with cellulite and hair thinning: improves.
Hair diameter also increased significantly at week 24
Low-Molecular-Weight Collagen Peptide Supplementation Improves Cellulite Severity, Skin Elasticity, and Hair Shaft Diameter: A Clinical Study with Pharmacokinetic Evaluation - Randomised trial, 2025; menopausal women: improves.
significantly retarded hair shedding compared to the placebo
Calcium and Vitamin D Supplementation with and Without Collagen on Bone Density and Skin Elasticity in Menopausal Women-A Randomized Controlled Study
- Randomised trial, 2026; 114 people; women aged 20-50 with cellulite and hair thinning: improves.
Zinc: hair growth
The 1 study read (200 people in all) mostly found an improvement in hair growth. The evidence is limited.
1 study counted of 9 read: 1 trial (200 people in the trials).
- Randomised trial, 2003; 200 people; healthy men with androgenetic alopecia: improves. The effects of minoxidil, 1% pyrithione zinc and a combination of both on hair density: a randomized controlled trial
Key findings
- Hair GrowthImproves (the measure goes up)
Shop the evidence-backed picks
Fullscript collectionSkin: evidence-graded picksOpen on Fullscript
The collection holds the supplements we grade A or B for its theme, in third-party tested products where the catalog has them. It opens in our Fullscript store. You can look through it without signing in; Fullscript asks for a free account to order.
We earn from purchases made in our Fullscript store, and links to Fullscript, iHerb or Thorne carry our referral, so we may earn a commission at no extra cost to you. Grades come from the research and never change based on what we earn. Full disclosure
Studies cited
84 studies from PubMed
- Thymosin beta 4 as an Alzheimer disease intervention target identified using human brain organoids
- Thymosin Beta-4 Modulates Cardiac Remodeling by Regulating ROCK1 Expression in Adult Mammals
- CCN5 suppresses injury-induced vascular restenosis by inhibiting smooth muscle cell proliferation and facilitating endothelial repair via thymosin β4 and Cd9 pathway.
- Tβ4-exosome-loaded hemostatic and antibacterial hydrogel to improve vascular regeneration and modulate macrophage polarization for diabetic wound treatment.
- Corrigendum to 'Tβ4-exosome-loaded hemostatic and antibacterial hydrogel to improve vascular regeneration and modulate macrophage polarization for diabetic wound treatment' [Mater. Today Bio,Volume 31, 2025, 101585].
- Mechanistic study of the Tβ4/SLC7A11 signaling pathway regulating breast cancer evolution.
- Identification of glutamine as a potential therapeutic target in dry eye disease.
- Epimedin C promotes mitochondrial transfer and delays thymus atrophy in 4-VCD induced mimetic-menopausal mice.
- Thymosin β4 Regulates Tissue Inflammatory Response in Mouse Nonalcoholic Fatty Liver Disease by Promoting Macrophage M2-Type Polarization.
- Tβ4-Engineered ADSC Extracellular Vesicles Rescue Cell Senescence Through Separable Microneedle Patches for Diabetic Wound Healing.
- Enhancing fat graft survival: thymosin beta-4 facilitates mitochondrial transfer from ADSCs via tunneling nanotubes by upregulating the Rac/F-actin pathway.
- Comparative effects of dietary sodium butyrate and tributyrin on broiler chickens' performance, gene expression, intestinal histomorphometry, blood indices, and litter.
- Recombinant human thymosin beta 4 improves ischemic cardiac dysfunction in mice and patients with acute ST-segment elevation myocardial infarction after reperfusion.
- In Vitro Study of Thymosin Beta 4 Promoting Transplanted Fat Survival by Regulating Adipose-Derived Stem Cells.
- Thymosin β(4) and β(10) Expression in Human Organs during Development: A Review.
- Thymosin beta-4 denotes new directions towards developing prosperous anti-aging regenerative therapies
- Thymosin beta-4 - A potential tool in healing middle ear lesions in adult mammals
- Targeted Deletion of Thymosin Beta 4 in Hepatic Stellate Cells Ameliorates Liver Fibrosis in a Transgenic Mouse Model
- Deficiency of endothelial sirtuin1 in mice stimulates skeletal muscle insulin sensitivity by modifying the secretome.
- Thymosin β4 preserves vascular smooth muscle phenotype in atherosclerosis via regulation of low density lipoprotein related protein 1 (LRP1).
- Thymosin beta-4 participate in antibacterial immunity and wound healing in black tiger shrimp, Penaeus monodon.
- Thymosin Beta 4 Inhibits LPS and ATP-Induced Hepatic Stellate Cells via the Regulation of Multiple Signaling Pathways.
- The Pathophysiological Role of Thymosin β4 in the Kidney Glomerulus.
- The preliminary study of exosomes derived from thymosin beta 4-treated adipose-derived stem cells in fat grafting.
- Thymosin beta-4 improves endothelial function and reparative potency of diabetic endothelial cells differentiated from patient induced pluripotent stem cells.
- Aberrant Expression of Thymosin Beta-4 Correlates With Advanced Disease and BRAF V600E Mutation in Thyroid Cancer.
- The Role of Tβ4-POP-Ac-SDKP Axis in Organ Fibrosis.
- Thymosin beta 4 alleviates non-alcoholic fatty liver by inhibiting ferroptosis via up-regulation of GPX4
- Thymosin beta-4 prenatal administration improves fetal development and halts side effects due to preterm delivery
- Association between Thymosin beta-4, acute kidney injury, and mortality in patients with sepsis: An observational cohort study
- Adjunctive Thymosin Beta-4 Treatment Influences PMN Effector Cell Function during Pseudomonas aeruginosa-Induced Corneal Infection.
- Utilizing Developmentally Essential Secreted Peptides Such as Thymosin Beta-4 to Remind the Adult Organs of Their Embryonic State-New Directions in Anti-Aging Regenerative Therapies.
- Thymosin-β4 induces angiogenesis in critical limb ischemia mice via regulating Notch/NF-κB pathway
- Thymosin beta 4 attenuates PrP(106-126)-induced human brain endothelial cells dysfunction.
- Antimicrobial Effects of Thymosin Beta-4 and Ciprofloxacin Adjunctive Therapy in Pseudomonas aeruginosa Induced Keratitis.
- Thymosin β4: A Multi-Faceted Tissue Repair Stimulating Protein in Heart Injury
- miR-200a mediates protection of thymosin β-4 in cardiac microvascular endothelial cells as a novel mechanism under hypoxia-reoxygenation injury.
- Inhibition of microRNA-34a mediates protection of thymosin beta 4 in endothelial progenitor cells against advanced glycation endproducts by targeting B-cell lymphoma 2.
- Thymosin β-4 is a novel regulator for primary cilium formation by nephronophthisis 3 in HeLa human cervical cancer cells.
- Ethosomal Gel for Improving Transdermal Delivery of Thymosin β-4.
- Thymosin beta 4 regulation of actin in sepsis
- Thymosin beta 4 and the eye: the journey from bench to bedside
- Sources of variability in quantifying circulating thymosin beta-4: literature review and recommendations.
- Thymosin beta-4 overexpression correlates with high-risk groups in gastric gastrointestinal stromal tumors: A retrospective analysis by immunohistochemistry.
- Targeted delivery of thymosin beta 4 to the injured myocardium using CREKA-conjugated nanoparticles.
- Thymosin beta-4 regulates activation of hepatic stellate cells via hedgehog signaling.
- Potential role of thymosin beta 4 in the treatment of nonalcoholic fatty liver disease.
- Recombinant adeno-associated virus carrying thymosin β(4) suppresses experimental colitis in mice.
- Adsorption effects of the doping relevant peptides Insulin Lispro, Synachten, TB-500 and GHRP 5.
- Cardioprotection by Thymosin Beta 4
- Thymosin Beta 4: A Potential Novel Therapy for Neurotrophic Keratopathy, Dry Eye, and Ocular Surface Diseases
- Thymosin Beta 4 Is a Potential Regulator of Hepatic Stellate Cells
- Comparison of various in vitro model systems of the metabolism of synthetic doping peptides: Proteolytic enzymes, human blood serum, liver and kidney microsomes and liver S9 fraction.
- Thymosin beta 4 up-regulates miR-200a expression and induces differentiation and survival of rat brain progenitor cells.
- Thymosin β4: multiple functions in protection, repair and regeneration of the mammalian heart
- Thymosin Beta-4 Induces Mouse Hair Growth
- Potential role of thymosin Beta 4 in liver fibrosis
- MALDI-imaging reveals thymosin beta-4 as an independent prognostic marker for colorectal cancer.
- Primary Mechanisms of Thymosin β4 Repair Activity in Dry Eye Disorders and Other Tissue Injuries.
- Thymosin Beta-4 Recombinant Adeno-associated Virus Enhances Human Nucleus Pulposus Cell Proliferation and Reduces Cell Apoptosis and Senescence.
- N-acetyl-seryl-aspartyl-lysyl-proline (Ac-SDKP): Potential target molecule in research of heart, kidney and brain.
- Thymosin beta 4 and thymosin beta 10 expression in hepatocellular carcinoma.
- Thymosin β4 enhances the healing of medial collateral ligament injury in rat
- Roles and mechanisms of β-thymosins in cell migration and cancer metastasis: an update.
- Thymosin β4: a multi-functional regenerative peptide. Basic properties and clinical applications
- The regenerative peptide thymosin β4 accelerates the rate of dermal healing in preclinical animal models and in patients
- Thymosin beta 4 ameliorates hyperglycemia and improves insulin resistance of KK Cg-Ay/J mouse
- Thymosin β4: a potential molecular target for tumor therapy.
- No muscle for a damaged heart: thymosin beta 4 treatment after myocardial infarction does not induce myocardial differentiation of epicardial cells.
- Thymosin β4 and cardiac protection: implication in inflammation and fibrosis.
- Thymosins and muscle regeneration.
- Thymosin beta4 and cardiac repair
- Thymosin beta4 enhances repair by organizing connective tissue and preventing the appearance of myofibroblasts
- Thymosin beta4 regulates migration of colon cancer cells by a pathway involving interaction with Ku80.
- Progression of ocular sulfur mustard injury: development of a model system.
- Thymosin beta4 and corneal wound healing: visions of the future.
- Treatment of chronic nonhealing neurotrophic corneal epithelial defects with thymosin beta4.
- Thymosin beta4 is cardioprotective after myocardial infarction
- Thymosin beta 4: A novel corneal wound healing and anti-inflammatory agent
- Adhesive and proteolytic phenotype of migrating endothelial cells induced by thymosin beta-4.
- Localization of thymosin beta-4 in tumors.
- Antimicrobial peptides from human platelets.
- Thymosin beta4 accelerates wound healing
- Thymosin beta 4 stimulates directional migration of human umbilical vein endothelial cells.