Do NOT take this unless you want to deal with major side effects like mood swings and depressing thoughts! My friend and I have been using this for a month and all we felt on the days we took the pills were extreme anger and irritation for me and depressing thoughts and feelings of loneliness for her. We decided to not take then for 2 days and resume again and we realized that on those 2 days we felt completely normal! I threw them away and recommend that you take regular biotin vitamins because it's much safer than Revitalocks.