Peptides are surging in popularity. There's little evidence that they work.

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Experts fear that making peptides more accessible puts the cart before the horse, with too many questions remaining about if they're safe and effective.

Peptides may have a lot of untapped potential, but online, they’re advertised for uses far beyond what the science has actually found — such as reducing wrinkles, boosting muscle growth, and improving sleep and libido.Justine Goode / NBC News; Getty Images

April 7, 2026, 12:45 PM EDT

By Aria Bendix and Berkeley Lovelace Jr.

The wellness app Noom is getting into the peptide market.

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