10 Best Hair Growth Vitamins 2025 in the United States

There are a number of vitamin supplements that help prevent and reverse hair loss. For example, they may contain biotin (formerly known as Vitamin B7)--because biotin deficiency has been linked to hair loss. Then there is keratin, the protein that is the main component in hair and nails. Most hair growth vitamin supplements will also contain iron, folic acid, zinc, iodine, and many more nutrients that are not usually included in generic vitamin supplements. You have to take note of reviewers' comments about the products that they have tried: some people may suffer side effects, while others may see negligible improvement. And other supplements have to be taken over an extended period of time.