Hair loss and thinning can have many causes—stress is a big one, for example—but there are hair growth vitamins and minerals you can pop each morning that can support healthy hair growth. A supplement with keratin, biotin, collagen peptides, hyaluronic acid, all the alphabetic vitamins, or any combination of the above can help your hair grow back longer and stronger in as little as a few weeks. The key to getting the best results? Be consistent with the pills and commit to them daily for at least six months. Ahead, the 16 best pills, powders, and crazy-delicious gummies for healthier and thicker hair.