TB-500 and Post-Surgery Recovery: What Has Been Studied

What the research covers

No human study of TB-500 after surgery was found. Its key ingredient is a lab-made copy of a short piece of thymosin beta-4, a larger natural protein. The piece is 7 amino acids long.

One rodent (rat) study gave TB-500 after surgery. The team cut and repaired the Achilles tendon. TB-500 was then injected into the belly cavity at 60 micrograms per kg a day for 4 weeks. The repaired tendons were significantly stronger than in the control group. Tissue scores also improved. Adding BPC-157 gave no extra benefit.

Wound data come from the full protein, not TB-500. In rodent (rat) skin wounds, thymosin beta-4 on the skin or injected sped the regrowth of skin over the wound. In a phase 2 trial, 73 people with leg ulcers from poor vein flow were randomly given it or a placebo on the wound. Safety was similar to placebo. The authors said a 0.03% dose may speed healing.

A PubMed search on 27 September 2026 found no study that gave TB-500 to people. It also found no trial of thymosin beta-4 after surgery on muscles, tendons or joints.

Sources

1. Guarnera G, DeRosa A, Camerini R The effect of thymosin treatment of venous ulcers. Ann N Y Acad Sci (2010). PMID 20536470 doi:10.1111/j.1749-6632.2010.05490.x Human phase 2, randomized, placebo-controlled, 73 people with venous stasis ulcers; topical full-length thymosin beta-4 or placebo; safety comparable to placebo; 0.03% dose may speed healing.
2. Bicer O, Adanir O, Guleryuz Y, et al. Effects of BPC-157 and TB-500 on Achilles tendon healing in rats: A histopathological and biomechanical study. Jt Dis Relat Surg (2026). PMID 42542926 doi:10.52312/jdrs.2026.2951 Rodent (rat), Achilles tendon cut and repaired; TB-500 60 micrograms per kg a day intraperitoneally for 4 weeks; stronger tendons; no added benefit with BPC-157.
3. Malinda KM, Sidhu GS, Mani H, et al. Thymosin beta4 accelerates wound healing. J Invest Dermatol (1999). PMID 10469335 doi:10.1046/j.1523-1747.1999.00708.x Rodent (rat) full-thickness skin wounds; full-length thymosin beta-4 on the skin or intraperitoneally; faster skin regrowth at days 4 and 7.
4. Ho EN, Kwok WH, Lau MY, et al. Doping control analysis of TB-500, a synthetic version of an active region of thymosin beta(4), in equine urine and plasma by liquid chromatography-mass spectrometry. J Chromatogr A (2012). PMID 23084823 doi:10.1016/j.chroma.2012.09.043 Identifies the key ingredient of TB-500 as acetylated LKKTETQ, the 17-23 segment of thymosin beta-4.
5. Delcourt V, Garcia P, Chabot B, et al. TB500/TB1000 and SGF1000: A scientific approach for a better understanding of misbranded and adulterated drugs. Drug Test Anal (2023). PMID 36482504 doi:10.1002/dta.3421 Analysis of products sold online as TB500; contents not consistently matching earlier descriptions.