Yes, biotin shampoo is good for slowing hair loss. As mentioned in our earlier article, biotin deficiency can lead to hair thinning faster. When used on the scalp correctly, biotin shampoos can help increase your body's biotin levels, without having to take an oral pill, and encourage healthy hair growth. The biotin vs prenatal vitamins for hair growth argument is a topic we’ll dive into even further in another NHP article.