WebMD Answers
There is no research that biotin causes weight gain. Weight gain is typically caused by a calorie imbalance and certain medications, but not vitamins. A balanced diet is more effective than supplements which is explained in this post: http://www.webmd.com/healthy-beauty/hair-health-11/eat-hair-type?page=1 For more specifics on biotin uses, evidence and side effects, visit this page: http://www.webmd.com/vitamins-supplements/ingredientmono-313-BIOTIN.aspx?activeIngredientId=313&activeIngredientName=BIOTIN
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