What are the side effects of Nail-ex?

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It's rare to experience side effects from Nail-ex or other biotin supplements. There have been occasional reports of biotin supplements causing hives and/or gastrointestinal upset in some people. There has been a single report of a woman who experienced a life-threatening lung condition called eosinophilic pleuropericarditis after consuming biotin along with pantothenic acid, another B vitamin, but more study is needed to understand this reaction.

As with all dietary supplements, talk to your doctor before you take Nail-ex or other products that contain biotin.