In a unilateral declaration by the health secretary, several injections promoted by online influencers will become widely available. The F.D.A. had advised against the move.
Peptides are short chains of amino acids that give the body basic instructions. While the F.D.A. has approved some peptide compounds, such as insulin to manage diabetes, many others lack scientific evidence of efficacy or safety.
Health officials will now allow some levels of a powerful substance to remain in products marketed as natural. The change could help a G.O.P. donor facing wrongful death lawsuits.
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