I've been taking biotin for hair for a few months already. I like how it works, my hair is getting really thinner, and I feel my nails are getting stronger. As for skin, I do not see much changes, but I have very deep wrinkles, so I'm not sure any supplement can help me in a few months. The brand is Nutraharmony, and I chose this biotin because it is combined with collagen and keratin, it's a very effective formula for me. I tried just biotin before, and the results were not that visible.