Skeletal Strength (Formerly SKL) [Structural] is a key product formulated to provide nutrients that must be present for proper structural system function. Skeletal Strength provides nutrients the body uses to manufacture bones, muscles, ligaments, tendons and skin. Four tablets contain: % DV Vitamin A (beta-carotene) 500 IU 10Vitamin C 150 mg 250Vitamin D 200 IU 50Vitamin B6 (pyridoxine HCl) 5 mg 250Vitamin B12 (cyanocobalamin) 30 mcg 500Calcium 600 mg 60Iron (ferrous gluconate) 3 mg 17Phosphorus 192 mg 20Magnesium 600 mg 150Zinc 15 mg 100Copper 2 mg 100Manganese 1 mg 50Potassium 100 mg *Boron 1 mg **Daily Value not established All these are contained in a base of: Horsetail herb Betaine HCl Papaya fruit Parsley herb Pineapple fruit Valerian root Licorice root