TB-500
Shop TB-500Also called: TB500, TB-4 + BPC-157 (Popular Healing Stack), TB-4 + TB-500
TB-500 is a man-made copy of a small piece of a natural protein called Thymosin Beta-4. Your body already makes this protein, and it is found in blood cells and almost every cell. In stores, TB-500 is sold as a white powder in small bottles. It is labeled for lab research only, not for people to take. Some people buy it anyway because of stories about faster healing.
In lab tests, TB-500 helps cells move to places that need fixing. It does this by controlling a building-block protein that gives cells their shape and lets them crawl. This may help new blood vessels grow and may help hurt tendons, muscles, and skin mend. Scientists have seen these effects mostly in animals and in dishes of cells, not in large human studies. No one has proven TB-500 is safe or works in people.
It is not approved by the FDA as a medicine. The powder must be mixed with water and kept cold, and it is unclear how clean or strong the products sold online really are. Side effects in humans are unknown. Anyone thinking about using it should know the evidence is early and the risks are not mapped out.
Building Blocks
TB-500 in Stacks & Blends
TB-500 is one of the building blocks in these 2 blends and stacks people actually buy:
Regulatory status
On July 23, 2026, PCAC voted 8–6–1 to recommend adding TB-500 to the Section 503A Bulks List. The recommendation is non-binding; FDA rulemaking must follow before any change in legal status, typically 12–24 months. TB-500 is not on the 503A Bulks List and remains an unapproved new drug that 503A pharmacies cannot lawfully compound pending final FDA action.
Benefits
What TB-500 Helps With
The main themes across 37 research studies, in plain language.
Cardiovascular & vascular
Angiogenesis & blood flow
60/100Rated 60/100Source typeSpecialist communityIndependent sources6Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 30 underlying claimsStudies indicate it promotes the formation of new blood vessels and enhances circulation to injured areas.
Cardiac tissue repair
40/100Rated 40/100Source typeVendor / seller pageIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 20 underlying claimsStudies suggest it may protect heart tissue after injury and improve cardiac function by activating progenitor cells.
Wound & tissue repair
60/100Rated 60/100Source typeSpecialist communityIndependent sources5Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 45 underlying claimsResearch suggests it accelerates the healing of skin, corneal, and connective tissues by promoting cell migration and reducing repair time.
Musculoskeletal recovery
40/100Rated 40/100Source typeVendor / seller pageIndependent sources4Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 25 underlying claimsEvidence suggests it supports the repair of tendons, ligaments, and muscles while potentially improving flexibility.
Research examples
- Accelerates tissue repair and wound healing in muscles, tendons, and ligaments
- Speeds up recovery from muscle, tendon, and ligament injuries
- Improved flexibility
Gastrointestinal & gut repair
60/100Rated 60/100Source typeSpecialist communityIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 5 underlying claimsResearch suggests it may aid in healing intestinal lesions and reducing gut permeability.
Anti-inflammatory action
50/100Rated 50/100Source typeUnclassified sourceIndependent sources5Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 25 underlying claimsResearch points to a reduction in inflammatory cytokines and modulation of immune signaling pathways.
Antimicrobial activity
60/100Rated 60/100Source typeSpecialist communityIndependent sources5Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 4 underlying claimsSome studies suggest it possesses antimicrobial properties, particularly in the context of eye infections.
Cellular migration & actin regulation
40/100Rated 40/100Source typeVendor / seller pageIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 18 underlying claimsResearch indicates it regulates cell movement and structural proteins essential for tissue regeneration.
Anti-fibrotic & scar reduction
50/100Rated 50/100Source typeUnclassified sourceIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 15 underlying claimsResearch indicates it helps reduce excessive scar tissue formation and fibrosis in organs and skin.
Metabolic & organ support
60/100Rated 60/100Source typeSpecialist communityIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 14 underlying claimsLimited evidence suggests potential roles in insulin sensitivity, kidney protection, and mitochondrial function.
Neuroprotection & cognitive
40/100Rated 40/100Source typeVendor / seller pageIndependent sources9Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 12 underlying claimsPreliminary research suggests it may support neuron survival and aid recovery after brain or nerve injuries.
Antioxidant & anti-aging
50/100Rated 50/100Source typeUnclassified sourceIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 5 underlying claimsStudies suggest it may reduce oxidative stress markers and combat signs of cellular aging.
Hair & skin rejuvenation
40/100Rated 40/100Source typeVendor / seller pageIndependent sources4Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 12 underlying claimsStudies suggest it may stimulate hair follicle activity and improve skin structure through collagen synthesis.
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Technical Details (sequence & mechanism — click to expand)
Amino Acid Sequence
Mechanism of Action
TB-500 is a synthetic version of thymosin beta-4, an endogenous 43-amino-acid peptide that sequesters G-actin to drive cytoskeletal remodeling and directed cell migration. It promotes keratinocyte, fibroblast, and endothelial migration, upregulates VEGF/bFGF to stimulate angiogenesis, and modulates inflammation. Evidence is predominantly preclinical with some early-phase clinical study.
Evidence
Research Citations (10)
Every claim above traces back to a source you can check — here are 10 of them.
- Source
Thymosin beta4 accelerates wound healing.
AnimalStudy1999 Key study 86/100Rated 86/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
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
Review2021 78/100Rated 78/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
PubChem - Compound - Tb500
95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Synthesis and characterization of the N-terminal acetylated 17-23 fragment of thymosin beta 4 identified in TB-500, a product suspected to possess doping potential.
2012 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
The actin binding site of thymosin beta 4 mapped by mutational analysis
95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
The actin binding site of thymosin beta 4 mapped by mutational analysis.
1996 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Simultaneous quantification of TB-500 and its metabolites in in-vitro experiments and rats by UHPLC-Q-Exactive orbitrap MS/MS and their screening by wound healing activities in-vitro.
2024 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
The potential use and abuse of thymosin β-4 in sport and exercise science.
2013 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Thymosin β4 and Actin: Binding Modes, Biological Functions and Clinical Applications.
2023 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Doping control analysis of TB-500, a synthetic version of an active region of thymosin β₄, in equine urine and plasma by liquid chromatography-mass spectrometry.
2012 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
News
Latest on TB-500
Dated, sourced reporting that mentions TB-500.
New York Times sorts peptide-therapy hype from evidence across skincare, muscle-building, and longevity
A November 2025 New York Times explainer takes a skeptical consumer lens to the peptide-therapy craze, separating the few uses with reasonable evidence (topical GHK-Cu and Matrixyl-type peptides in skincare) from the largely unproven injectable and "biohacking" market (BPC-157, TB-500, epitalon, semax, selank). Dermatologists frame cosmetic peptides as "sidekicks, not hero ingredients," while endocrinologists warn that growth-hormone-releasing peptides like sermorelin and tesamorelin carry the same long-term risks as HGH — diabetes, certain cancers, and acromegaly. The piece notes that most longevity claims rest on cell-culture or animal data only, and that "research-grade" products have no quality controls.
CNN investigation: wellness influencers drive boom in unapproved "research-use-only" peptides
A November 2025 CNN report documents how celebrities and wellness influencers are fueling mass consumer use of unapproved peptides like BPC-157, TB-500, ipamorelin, and CJC-1295, many sold with a "for research use only" label that lawyers and regulators describe as a loophole to evade FDA oversight. Health Secretary Robert F. Kennedy Jr. has vowed to end the agency's "war on peptides," while named sellers such as biohacker Gary Brecka market injectable vials for $350 to $600 each. Independent experts — including Scripps' Dr. Eric Topol and UC Davis biologist Paul Knoepfler — stress that none of these compounds have passed adequate clinical trials and that "research-grade" powders often contain contaminants. BPC-157 and TB-500 are also banned by international sports authorities as doping substances.
FDA PCAC 2026: committee backs six peptides for compounding, rejects Emideltide
On July 23–24, 2026, the FDA's Pharmacy Compounding Advisory Committee recommended adding six of seven reviewed peptides (BPC-157, KPV, TB-500, MOTS-c, Epitalon, Semax) to the Section 503A Bulks List and rejected Emideltide/DSIP. The vote is advisory only — not a final FDA decision and not legal authorization to compound. FDA must still complete formal notice-and-comment rulemaking (typically 12–24 months) before any change in legal status.
FDA reviews BPC-157, TB-500 and other peptides favored by RFK Jr. | AP News
A federal advisory panel has narrowly voted to recommend easing FDA restrictions on the compounding of specific peptides, including BPC-157 and TB-500. This advice, which is not binding, contradicts FDA scientists who warn of insufficient safety and efficacy data. The decision aligns with the views of Health Secretary Robert F. Kennedy Jr. and could lead to increased availability of these substances through telehealth and compounding pharmacies.
FDA fires warning letters at online peptide vendors selling BPC-157, TB-500 as drugs
Across 2025-2026 the FDA's Office of Compliance issued a string of warning letters to internet peptide retailers - including USApeptide.com (February 2025), Gram Peptides (March 2026), and Wholesale Peptide (June 2026) - alleging they are selling unapproved new drugs in violation of Section 505(a) of the FD&C Act. The letters single out products marketed for healing, recovery, and research that the agency says carry disease-treatment claims triggering drug status. Named substances include BPC-157, TB-500 (thymosin beta-4), CJC-1295, ipamorelin, and GHK-Cu. The enforcement runs in tension with the July 2026 PCAC vote recommending several of these same peptides for the 503A compounding list, but legally the two tracks are separate.
Wondering how TB-500 pricing compares across suppliers? Our original market data shows the full picture.
See the State of the Peptide Market 2026 →Related on The Health Stacks
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