What’s behind the trendy peptide injections being sold by influencers and RFK Jr. allies

More Americans are turning to peptides for muscle building, skin rejuvenation, and to try and live longer even though the substances aren’t FDA approved. Doctors warn that most haven't undergone adequate clinical trials and the supposed benefits are unproven. The FDA has tried to crack down, sending warning letters and listing peptides that shouldn’t be compounded. But Robert F. Kennedy Jr. has vowed to end the FDA’s restrictions, and he has support from wellness advocates. Critics caution that these peptides may pose serious health risks. And experts warn there’s no way to know what exactly is in the products being touted by celebrities and hawked on platforms like TikTok.