Nutritionn Biotin is great for hair, skin, and nails. This B vitamin is also known as vitamin B7, or vitamin H. It is water-soluble, meaning the body uses what it needs and gets rid of the rest through urine. This means that it is difficult to consume too much. Biotin is a common ingredient in beauty products. It is popular with people that want to grow, thicken, or strengthen their hair. This vitamin has been proven to be more effective when consumed rather than used externally. This premium supplement is a great natural health solution.