What is the difference between TB-500 and thymosin beta-4?

Size and evidence. Thymosin beta-4 is the complete 43 amino acid natural protein. It has been through early, mid-stage, and late-stage studies in people for wound healing, heart repair, and eye problems. TB-500 is a lab-made 7 amino acid piece of it. In animal studies it copies part of the parent's effect on actin (a protein that shapes cells), but it has no published study in people of its own. Selling one using evidence that belongs to the other is the exact mix-up the FDA's 2026 review flagged.

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of healing and recovery peptides. BPC-157, TB-500, GHK-Cu, and the tissue repair family, including what actually has human data.