Cheating in sport: What are banned substances? CNN The U.S. Food and Drug Administration is moving toward allowing compounding pharmacies to produce more than a dozen injectable peptides that were banned because of potentially significant safety risks, the New York RFK Jr. wants Americans to use peptides that were banned over safety risks Ars Technica Banned Substances Can Still be Sold Informed Sport Are Peptides Legal Again in 2026? Here is what RFK Jr. Just Announced