Getting enough vitamins and minerals in your diet means healthier-looking hair but these same compounds can also work wonders from the top down, protecting against the formation of destructive molecules known as free radicals.

Biotin is water-soluble, and part of the B-vitamin complex. The body uses biotin in the metabolism of fatty acids, glucose, and amino acids. In other words, it needs biotin to turn food into fuel, and without enough, hair and nails can become weak or brittle. Adding biotin to haircare products is thought to help improve both hair’s health and strength.

B-complex vitamins contain biotin, which as noted above, is essential for healthy, strong hair. Adding B-complex vitamins to hair products is thought to promote thicker, more luxurious locks.

CoQ10 is a powerful antioxidant produced in the body and used to fight free radicals within cells. Since the body produces less CoQ10 with age, cells become more vulnerable to damage over time. Haircare products that contain CoQ10 may provide added protection from oxidation and damage.

Hyaluronic acid is found in skin cells, joint fluid, and connective tissue where it works to keep everything cushioned and lubricated. Factors such as diet, lifestyle, and age can decrease how much your body produces over time. When used as a haircare ingredient, hyaluronic acid is thought to promote a healthy scalp and lustrous hair.

Vitamin C is likely the most well-known antioxidant. Besides fighting free radicals, this water-soluble vitamin is added to haircare products to help remove product buildup, and to leave hair looking clean and shiny.

Vitamin E is a fat-soluble antioxidant essential for maintaining healthy hair and skin. As a haircare ingredient, it is believed to contribute to a healthy scalp and healthy hair.