Zinc (Zinc Citrate)
Zinc is considered an essential nutrient, meaning that your body can’t produce or store it. For this reason, you must get a constant supply through your diet and supplements. Zinc is essential for cell growth and division, immune function, enzyme reactions, and protein production.
Some studies have suggested that the boosted combination of folate (folic acid), biotin, and zinc may help stimulate and grow thicker hair.