Compound Library

Peptide / Repair

Thymosin Beta-4 Fragment (TB4-Frag)

Active 17-amino acid fragment of TB-500 (Ac-SDKPDMAEIEKFDKSKLKK). Same healing mechanism as TB-500 but more targeted. Some researchers prefer for hair regrowth protocols.

Build protocol outline Open dose calculator TNHL ebooks
Educational reference only. This page does not diagnose, prescribe, or replace care from a licensed professional. Laws, availability, and clinical appropriateness vary by location.
Reference dose2–5 mg/week SubQ
Half-life2 hours
Risk flaglow
Regulatory noteResearch-only flag

Side effects and watch-outs

  • Fatigue
  • Injection site reaction
  • Mild nausea
  • Same theoretical angiogenesis concern as TB-500