The Human Lab Rats Injecting Themselves with Peptides Office for Science and Society McGill University Is BPC 157 Banned? Oral vs. Injectable Forms Explained The FDA has issued warning letters to multiple companies marketing compounded Retatrutide, an investigational drug from Eli Lilly still in Phase II trials. While early studies have shown promising weight loss results, Retatrutide New: An FDA decision to place 19 peptides on the unsafe list was supported by numerous documented safety concerns, former officials said. Even though demand for peptide therapies has exploded since then,