Herbal Extracts Support Nail Health Nail, Hair and Skin Connection provides 445 milligrams of Nail, Hair and Skin Complex with a 4:1 extract of naturally occurring silica, from horsetail herb, to fortify nail strength plus high-potency biotin. Targeted Nutrients Support Tissue and Cell Health Every day your body is exposed to free radicals; this product provides vitamins A, C, E, and selenium, antioxidants that helps support your cellular health. This product contains soy.