Mason Natural Vitamin K2 plus Vitamin D3 once per day tablets may support bone health. Our formula combines 100 mcg of vitamin K2 menaquinone with 25 mcg (1000iu) vitamin D3, plus 32 mg of calcium. It is guaranteed no added yeast, milk, egg, fish, crustacean shellfish, tree nuts, peanuts, or wheat. No artificial fragrance, colors, flavors or preservatives. It is soy free. Vitamin K2 may help to support the bonding of calcium to the bone matrix, which supports healthy bone density and strength. Vitamin K2 has this effect by supporting natural, healthy levels of osteocalcin, a hormone important to bone formation. Vitamin D3 may help to support healthy calcium metabolism by increasing intestinal calcium absorption.