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Scientists Warn Injectable Peptides Lack Evidence Despite Influencer Hype

FDA warns about safety risks of unapproved peptides sold online and highlights challenges in regulating compounding pharmacies amid growing consumer demand.

  • This week, scientists and clinicians warned many injectable synthetic peptides sold online are unproven and pose safety risks, according to the FDA.
  • Influencers and online sellers promote peptides as boosting muscle growth, immune function, and slowed aging, while many products labeled 'not for pharmaceutical use' flood a largely unregulated online market.
  • Experts including Paul Knoepfler, cell and molecular biologist, warn `You must test these in clinical trials to be sure of anything positive or negative` and caution about arbitrary dosing and contamination risks.
  • Regulators warn that compounding pharmacies operate under different oversight than drug manufacturers, raising quality-control concerns, though Scott Brunner says they are licensed and inspected by state boards of pharmacy.
  • Some approved peptide drugs illustrate the difference, and while many peptides lack safety data, patients and clinicians advise consulting a physician and using compounding pharmacies to reduce risk.
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Associated Press News broke the news in United States on Friday, November 14, 2025.
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