12 Best Vitamins for Hair Growth, According to Dermatologists

3. Nature’s Bounty Biotin

BEST VALUE VITAMINS FOR HAIR GROWTH

This B vitamin is an ingredient in many different hair supplements—for good reason. “Biotin is a water-soluble vitamin that supports the growth of hair, skin, and nails by helping to break down fats and carbohydrates,” says Dr. Engelman. Run low and you may notice your hair is weak, or you may start to lose it.

You can expect the vitamin to increase the speed of hair growth, but it won’t increase thickness, she says. However, it is far cheaper than other supplements, making it a good starting point. For one good biotin supplement, Debra Jaliman, M.D., a board-certified dermatologist in New York City and the author of Skin Rules, recommends Nature’s Bounty Biotin.

4. Keranique KeraViatin Hair & Scalp Health Supplements

BEST B COMPLEX VITAMINS FOR HAIR GROWTH

This supplement packs a range of B vitamins to help the body break down nutrients to nourish hair growth, plus zinc, antioxidant curcuminoids, and amino acids like L-cysteine. “Cystine (which is formed by two cysteine molecules) is an amino acid, which is a protein building block that helps to maintain the structure of proteins in the body—and is one of the most crucial amino acids for hair growth,” says Dr. Jaliman.