Thymosin Alpha-1 vs TB-500
Thymosin Alpha-1 vs TB-500: immune modulation vs tissue repair — two thymosin-family peptides with distinct mechanisms. Here's a neutral, sourced side-by-side — no hype, every claim links to its evidence.
Thymosin Alpha-1
ApprovedAlso: Thymalfasin, Zadaxin
Thymosin Alpha-1 is a small protein made naturally in the body. It comes from a larger part of the body called the thymus.
TB-500
ResearchAlso: TB500, TB-4 + BPC-157 (Popular Healing Stack)
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.
At a Glance
| Thymosin Alpha-1 | TB-500 | |
|---|---|---|
| Research status | Approved | Preclinical |
| Highest-tier evidence | Peer-reviewed study | Peer-reviewed study |
| Research citations | 113 | 10 |
| Dosing routes | SubQ | — |
| Receptor targets | T-cell/dendritic-cell signaling | G-actin, VEGF, bFGF |
| Half-life | — | — |
| Known side effects | 12 | 0 |
Research Areas
Top preclinical research areas — cited studies for each.
Thymosin Alpha-1
- Immune modulation (T-cell)
- Adjunct for chronic hepatitis B
TB-500
- Wound/tissue repair
- Angiogenesis
- Anti-inflammatory
How People Use It
Reported routines — research only, not medical advice.
Thymosin Alpha-1
- SubQ — 1.6 mg (900 µg/m²) subcutaneously twice a week for 6 to 12 months
TB-500
Not yet documented for TB-500 — being compiled.
The Evidence
Key studies — click through to verify each on PubMed.
Thymosin Alpha-1
113 sourced studies
- Source
Thymosin alpha 1: A comprehensive review of the literature
Review2020 Key study 84/100Rated 84/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
FDA orphan drug designation - Thymosin Alpha-1 (Ta1)
Guideline2023 85/100Rated 85/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
PubChem - Compound - Thymalfasin
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 alpha1: a historical overview.
2007 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 →
TB-500
10 sourced studies
- 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 →
Decision Guide
How to Choose
Neither is a “winner” — they suit different goals. Compare the documented benefits and evidence above against what you’re actually trying to achieve, note the research status (approved vs research-stage), and read each full guide before deciding. Many people also stack peptides rather than pick one.
Source Thymosin Alpha-1
Shop Thymosin Alpha-1Source TB-500