Modelled on the protein your body sends to an injury.
TB-500 prescribed on its own for members focused on soft-tissue recovery. Evaluated by a licensed Apex MD provider and filled by a licensed U.S. pharmacy.
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Thymosin beta-4 is a 43-amino-acid protein found in nearly every human cell and concentrated in platelets and wound fluid. TB-500 is a short synthetic fragment that copies the segment of that protein which binds actin.
The two are related but not identical. Most published research, and all of the human trial data, studied the full-length protein rather than the fragment.
Thymosin beta-4 binds actin, the building block of a cell's internal scaffolding. That lets cells change shape and move, which is how skin, blood-vessel and repair cells reach injured tissue.
In animal models the full protein also supported new blood vessel growth and lowered inflammatory signalling. How much of that the fragment shares is still being worked out.
Every finding is labelled by the kind of study it came from, with the source linked.
In rats, thymosin beta-4 sped up skin wound closure, with re-epithelialization up 42% at day four and 61% at day seven.
Malinda et al., J Invest Dermatol, 1999In a placebo-controlled safety study, 40 healthy volunteers received thymosin beta-4 intravenously for up to 14 days with no serious adverse events.
Ruff et al., Ann N Y Acad Sci, 2010As an eye drop in 72 people with dry eye, thymosin beta-4 lowered discomfort scores by 27% over 28 days. This was the full protein, used topically.
Sosne et al., phase 2 trial, 2015In a rat model of Achilles tendon repair, four weeks of TB-500 increased the load the repaired tendon could bear before failing.
Bicer et al., Joint Diseases and Related Surgery, 2026No human trial has tested the TB-500 fragment itself, and no thymosin product has been tested in people for tendon, muscle or athletic recovery.
FDA evaluation of TB-500, 2026Published research describes what was observed in a study. It is not a promise of what any product will do for you. Your provider will talk through what is realistic.
Small injections just under the skin, usually more frequent at first and then less often. Your provider sets the dose and the schedule. It arrives already reconstituted by the pharmacy, so there is no powder to mix and nothing to measure out.
Patients commonly describe changes in soreness or mobility over the first several weeks. These are patient reports, not trial outcomes, and results vary.
Peptides are not a substitute for diagnosis, physical therapy or orthopaedic care. Tell your provider about any injury you are treating.
Your provider reviews your full history. Tell them about every medication and condition, including any history of cancer.
Thymosin beta-4 and its derivatives, including TB-500, are prohibited at all times under World Anti-Doping Agency rules.
No. TB-500 is a short synthetic fragment of it. Most published research studied the full-length protein.
No. When prescribed it is a compounded medication, which has not been reviewed by the FDA for safety, effectiveness or quality.
The full protein has, mainly as eye drops, a skin gel and intravenous safety studies. The injectable fragment has no published human trials.
Usually as subcutaneous injections that are more frequent at first and then less often. Your provider sets the schedule.
Anyone with current or past cancer, anyone pregnant or nursing, and competitive athletes subject to testing.
Mostly injection-site reactions, headache and temporary tiredness. Long-term effects have not been studied.
BPC-157 and TB-500 together: the two most talked-about recovery peptides, prescribed as one protocol and overseen by a physician.
The Wolverine pairing with GHK-Cu added: a copper-carrying peptide your body makes naturally and that has been studied for skin.
A 15-amino-acid peptide modelled on a protective protein from the stomach, studied in animal models for tendon, muscle and ligament repair.
Answer a few questions. A licensed Apex MD provider decides whether it is right for you.
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease. Prescription products require an online evaluation with a licensed medical professional, who will determine whether a prescription is appropriate. Compounded medications are not FDA-approved and have not been evaluated by the FDA for safety, effectiveness or quality. Research cited on this site describes published studies and is not a claim about what any product will do for you. Individual results vary.
