I used to take HF 37, and viviscal. I liked them both, but stopped buying them because of the price. I now take one multivitamin, 1000 mg MSM, Cod liver oil, 1000 mcg Biotin, and 500 mg Silica everyday. I know that it's made a difference in my hair, because now I get about 3/4 inch a month (I colored my hair about a month ago, and can see the new growth).