Thymosin beta-4 (often written as T4 or TB4) is a naturally occurring peptide, and TB-500 (or fequesetide) is a synthetic peptide based on a segment of TB4.3 4 While TB4 is made up of 43 amino acids, TB-500 contains only seven.4 5 Sometimes, especially in earlier research, you may see TB-500 referred to by its amino acid sequence, Ac-LKKTETQ.6 Insider Tip: The Ac- before amino acid sequences, like those of peptides, means its been permanently modified with an added acetyl group a process called N-terminal acetylation to protect it from degradation.7 8 This can improve a peptides stability,9 bioavailability,10 and other properties.11 Though nearly all synthetic peptides are protected in one way or another during synthesis, this protection is usually reversible
This product is intended exclusively for in vitro laboratory research by qualified professionals
However, controlled studies in humans are needed to confirm any pain-relieving benefits
A 2006 Achilles-detachment study by Krivic and colleagues in the same journal applied BPC-157 intraperitoneally once daily at 10 g/kg, 10 ng/kg, or 10 pg/kg for 30 days in rats and reported that tendon-to-bone tissue, which did not heal spontaneously in saline controls, recovered with BPC-157 treatment, with directionally improved load-to-failure, stiffness, Young's modulus, and collagen organization at days 121, including in animals where healing had been impaired by 1 mg/kg 6-methylprednisolone though the abstract does not report numeric effect sizes or p-values
