Biotin is a B vitamin that is often promoted for its potential benefits for hair, skin, and nails. While some people believe that taking biotin supplements can improve the strength and growth of hair, there is limited scientific evidence to support this claim. However, biotin deficiency can lead to hair loss, so ensuring adequate intake of biotin through diet or supplements may be beneficial for individuals with deficiencies. An excess intake of biotin can lead to overstimulation of sebum production, which would also have adverse effects so it's always best to consult with a healthcare professional before starting any new supplement regimen, to ensure that you are taking only what your body really needs.