Should I worry about allergies with Nail-ex?

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The active ingredient in Nail-ex is 2,500 micrograms (mcg) of biotin, a B vitamin found naturally in the body and in many foods. Nail-ex tablets also contain other ingredients, including cellulose, magnesium stearate, and dicalcium phosphate. Do not take Nail-ex if you are allergic to biotin or any of the other ingredients. As with any dietary supplement, consult your doctor before taking Nail-ex.