Per an NCBI study, these nutrients are important building blocks for keratin protein and a key part of making sure our hair is thick, healthy, and strong.
Biotin
Biotin (B7) is a water-soluble form of vitamin B that supports hair growth and defends hair from environmental damage. Biotin metabolizes amino acids from foods which helps keratin form in hair and is one of the most popular purported vitamins for hair according to the National Institutes of Health.
Iron
Iron supports hair growth because it helps to form red blood cells that deliver oxygen and nutrients to the hair follicles. Hair loss is often a symptom of iron deficiency anemia.
Vitamin C
Vitamin C is a powerful antioxidant and protects hair follicles from damaging free radicals that contribute to discoloration and even hair loss.
Niacin
Niacin (vitamin B3) helps to repair the DNA in hair follicle cells. Without enough niacin, follicles may not produce hair efficiently.
Zinc
Zinc is important for hair growth because it supports DNA production. Without enough zinc, the protein structure of the hair follicle can deteriorate, causing hair shedding.
Source:
L'Oréal
