Natures Goodness hair skin and nails liquid is a premium blend of ingredients, supported by the latest scientific research, to support thick shiny hair, radiant skin and strong nails. Collagen is a critical component of healthy skin, giving skin its structural support and its elasticity. Vitamin C is required for collagen formation and normal connective tissue structure and function. Keratin is the major structural component of hair and nails, as well as being a key ingredient in the outer layer of skin. Lysine is an amino acid that is a critical component of keratin and collagen, folic acid is required for production of amino acids which are key components of keratin and collagen. Silica prompted thicker hair, collagen production and improves nail strength. Zinc and selenium contribute to maintenance of normal hair and nails. Lecithin promotes shiny hair and softer skin. Biotin contributes to the maintenance of normal hair and skin.