TB-500
A synthetic version of part of the thymosin beta-4 protein, sold as BPC-157's recovery sidekick. Popular in horse racing before it was popular in gyms — which tells you where the evidence comes from.
What people claim
Improves recovery, flexibility and healing; reduces inflammation; often 'stacked' with BPC-157 for injuries.
Human evidence
No robust human trials for the recovery claims. Full-length thymosin beta-4 has been studied clinically for a few specific conditions, but the grey-market 'TB-500' fragment people inject is not the same thing and isn't backed by human data.
Animal evidence
Animal and cell studies suggest thymosin beta-4 plays a role in cell migration and tissue repair. Much of the 'TB-500' hype borrows credibility from that protein research without matching products or doses.
Risk flags
- Mostly animal data
- Unregulated / grey-market supply
- Purity & quality unknowable
- Long-term effects unknown
- Theoretical growth/cancer debate
- Banned in tested sport (WADA)
- Injection & sterility risk
- Legal grey area (US/UK)
Regulatory status
US: Not FDA-approved. Prohibited in animal racing and banned by WADA in sport. Sold only as a 'research chemical.'
UK: No UK marketing authorisation; not a licensed medicine. WADA-banned. Grey-market only.
What people report
Typical reported ranges — reporting, not a recommendation
Vendor sheets and forums often report weekly totals in the low single-digit milligram range, sometimes split across the week and tapered after a 'loading' period.
Entirely anecdotal — there are no human trials for the injectable 'TB-500' fragment, so there is no evidence-based dose. Reports vary wildly and describe a grey-market product of unverifiable content. Reporting, not advice.
Everyone's an expert
Who says what
Gym Bros Say
"BPC's healing partner. You run them together for injuries — one for the local fix, one for the whole-body thing."
Clinics Say
Recovery-focused clinics bundle it with BPC-157 as a 'healing stack,' usually with more confidence than citations.
Reddit Says
Seen as BPC-157's less-essential cousin. Debate about whether it adds anything, and whether the 'stack' is just doubling your unknowns.
Science Actually Says
Grade D. The underlying protein is real science; the injectable fragment sold as 'TB-500' isn't backed by human evidence, and animal repair results don't reliably translate to people.
PeptideStackers Says
It rides BPC-157's coat-tails. 'Stacking' the two doesn't multiply the evidence — it multiplies the unknowns. Interesting protein, unproven product.
Honesty section
What we still don't know
- ?Whether the injectable fragment does anything the full protein research implies.
- ?Long-term human safety — no data.
- ?Whether combining it with other peptides changes the risk picture at all.
Real questions people ask
FAQ
- What does TB-500 do?
- It's marketed as a recovery aid based on thymosin beta-4's role in tissue repair in animal and cell studies. Whether the injected fragment helps humans recover is unproven.
- Is TB-500 the same as BPC-157?
- No. They're different molecules that get 'stacked' together in recovery folklore. Both share the same problem: strong animal interest, weak-to-absent human evidence.
- Does TB-500 show up on a drug test?
- It's banned by WADA, so for tested athletes it's a real anti-doping risk. Don't treat 'peptide' as a loophole.
Before you do anything
Questions to ask a qualified professional
- 01Is there any human evidence for the 'TB-500' fragment specifically, not thymosin beta-4 in general?
- 02What am I actually adding by combining two unproven compounds?
- 03If I'm a tested athlete, do I understand this is a WADA ban?