ResearchSafe

TB-500 (Thymosin Beta-4 (Synthetic))

Category: Healing & Recovery. Status: Research compound.

A synthetic version of thymosin beta-4, a naturally occurring 43-amino acid peptide that promotes cell migration, blood vessel growth, and reduces inflammation. Widely researched for tissue repair and regeneration.

How it works

Upregulates actin production to promote cell migration and proliferation, enhances angiogenesis, and reduces pro-inflammatory cytokines.

Key facts

  • Molecular weight: 4921 Da
  • Half-life: ~6 hours
  • Bioavailability: ~95% via subcutaneous injection
  • Storage: Lyophilized: -20°C long term. Reconstituted: 2-8°C for up to 14 days.

Dosing overview

  • Typical dose: 2-5 mg per dose
  • Frequency: Loading: 2x/week · Maintenance: 1x/week
  • Duration: 4-8 week loading, then maintenance
  • Route: Subcutaneous injection

Protocol notes

  • Loading phase: ~2-5 mg twice weekly for 4-6 weeks to build tissue levels.
  • Maintenance phase: 2-5 mg once weekly (or every other week) to hold results.
  • Frequently stacked with BPC-157 for synergistic soft-tissue recovery.

Reported benefits

  • Enhanced wound healing
  • Reduced inflammation
  • Improved flexibility
  • Cardiac tissue repair
  • Hair regrowth support

Possible side effects

  • Headache
  • Injection site redness
  • Temporary lethargy
  • Head rush

Research

  • Thymosin beta-4 promotes angiogenesis and wound healing (2020): Accelerated dermal wound closure and improved vascularization in animal models.
  • TB-500 effects on cardiac repair post-MI (2018): Reduced infarct size and improved cardiac function following myocardial infarction in mice.

Community reviews of TB-500

Rated 4.6 out of 5 from 21 community reviews by ResearchSafe members.

  • biohack_bree rated it 5/5 - My physio noticed the difference: Recovery protocol with TB-500 for about 2 months. The injured area went from constant nagging pain to manageable discomfort within 2 weeks, then to essentially pain-free by week 5. What surprised me was the systemic benefit. Sleep improved, general achiness from training reduced, and my skin looked healthier. The healing peptides seem to work on multiple levels beyond just the target injury. Sourcing is the main challenge. Insist on third-party testing and proper reconstitution. I noticed results are better when I inject close to the injury site rather than just in the belly fat.
  • research_marcus rated it 5/5 - Chronic issue finally improving after 2 weeks: Ran TB-500 through a recovery phase after pushing too hard in training. The difference versus my last recovery attempt without it was clear. Less downtime, less residual stiffness, and I bounced back to full training about 2 weeks sooner than I expected. Protocol was straightforward, daily injections in the AM. Mild injection site reactions a couple times, nothing major. No systemic side effects that I could identify. I am convinced this shortened my recovery meaningfully. The caveat is always sourcing and the fact that this is still a gray area legally and medically. Do your research and ma
  • paddles_ivan rated it 5/5 - Flexibility and less beat up overall: Where TB shines for me is flexibility and that general "my body feels less wrecked" sense. Ran a loading phase then maintenance for a couple months. Modest but real, and the whole-body coverage is the selling point. Injection sites were fine, one head-rush early. Patient people will get more out of it.
  • gains_kyle rated it 4/5 - Real but understated recovery boost: Recovery boost was real but understated, less soreness between sessions and slightly better mobility. Got a mild injection-site reaction a couple times. On its own it is easy to write off as placebo, stacked with BPC it made more sense to me. Worth it if you go in expecting subtle.
  • trains_diego rated it 5/5 - The systemic angle earned its keep: Jiu-jitsu, so I have injuries everywhere and a whole-body peptide made more sense than pinning ten spots. Six weeks in, mobility is up and the constant low-grade aches quieted down. It is not dramatic and I get why people call it placebo, but for spread-out wear and tear it worked for me where local stuff did not.
  • zone2_owen rated it 5/5 - Subtle, but my mornings changed: TB-500 is the definition of subtle. Ran 5mg a week loading for a month for chronic hip and lower-back stiffness. No aha moment, but by the end my morning range of motion was clearly better and I stopped constantly cracking my back. If you want something you feel day to day this is not it, it is a slow quiet improvement.

Compare TB-500

Community discussions about TB-500

Research and educational reference only. Not medical advice.