fda warning letter bpc-157 dietary supplement Hot-button peptides like and TB-500 that are used to speed up muscle recovery or improve sleep may soon become more broadly available to Americans. The products are popular with a group FDA's Overreach on Compounded Peptides

BPC-157 is a synthetic 15-amino-acid peptide (a pentadecapeptide, sequence Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val)

Body weight of the test subjects was measured when the patients were screened, when they were randomly assigned to treatment groups, and at weeks 2, 4, 6, 8, 10, 14, 18, 22, 26, and 32 [1]

Estimates based on peptide pharmacology research suggest perhaps 1-10% survives to reach systemic circulation, though this number represents speculation rather than measured data for BPC-157 specifically

This group has also recently reported (2025) that intravenous administration of BPC 157 had no side-effects and was well-tolerated in two women