This formula combines 5 key ingredients: Horsetail herb, Biotin, Vitamins C and B6 plus Zinc. Horsetail herb contains naturally occurring Silica. Biotin may support nail and hair health. Vitamin C supports collagen formation, assists in healing and repair of the skin and is necessary for the maintenance of healthy skin. Zinc supports healthy skin renewal processes plus Vitamin B6 may support healthy immune system function.