Peptides are surging in popularity. There's little evidence that they work. FDA Peptide Reclassification 2026: What It Means for Providers RFK Jr. promotes peptides. Now the FDA weighs easing limits on the unproven chemicals The Food and Drug Administration will hold a meeting this summer to consider easing restrictions on more than a half dozen peptide injections, a group of unapproved therapies that have become popular