Popular weight loss drugs linked to a surprising fingernail problem

A study of people taking GLP-1 medicines for weight loss or type 2 diabetes found more reports of nail problems than among people who had not used the drugs. Nail detachment, where a nail separates from the skin below it, was reported more than four times as often by users.

Researchers compared 575 medication users with 1,329 people with obesity and/or type 2 diabetes who had never taken the drugs. Participants came from France, the United States, Brazil and Mexico.

At least one nail disorder was reported by 66% of users and 53% of nonusers. Discoloration affected 46% of users, compared with 17% of the comparison group. The results were presented at the European Academy of Dermatology and Venereology Congress 2026.

The researchers also examined whether weight loss might explain the differences. Nail problems remained more common among GLP-1 users in an analysis limited to people who had lost weight, but the findings show an association, not proof that the drugs caused the changes.

Study author Dr. Charles Taïeb said earlier reports had largely been anecdotal. Further investigation will be needed to clarify the relationship and whether the medications themselves are responsible.