What’s Behind the Injectable Peptide Craze?

Grey-market injectable peptides—a group of substances with obscure, alphanumeric names like BPC-157, GHK-Cu, and TB-500—have gained a devoted following among biohackers and health optimizers. To explore how these unregulated compounds have entered the mainstream and what effects they may have on the body, Madeleine Finlay interviews journalist Adrienne Matei and Dr. Anna Barnard, an associate professor at Imperial College London who researches peptides.