Weight-loss drugs linked to nail detachment and hair loss, study finds

A study presented at the European Academy of Dermatology and Venereology Congress 2026 in Vienna linked GLP-1 weight-loss drugs to nail changes, hair loss and scalp irritation. Users showed a fourfold higher incidence of onycholysis, or nail detachment. Experts say more research is needed to prove the drugs cause these effects and advise against raising undue alarm among patients.