Biotin can improve your hair, nails and skin. Photo Credit Hemera Technologies/AbleStock.com/Getty Images. Being deficient in biotin can cause problems for your hair, nails and skin, and taking tablets of this vitamin can help to ensure that these and other parts of your body stay healthy. Furthermore, biotin may be able to improve hair, skin and nail texture and strength, even if you are not deficient in it. This vitamin is not known to cause adverse side effects, but you should still talk to your doctor before taking it.