Vitamins A, D3, and K2 work together to maximize cardiovascular and immune health, bone building, and calcium utilization. Carlson® A - D3 - K2 provides fat-soluble vitamin A as Retinyl Palmitate to promote healthy immune system function and stimulate our body's bone- building cells, osteoblasts; vitamin D as Cholecalciferol to support healthy immune system function, calcium absorption, and the growth and development of healthy bones and teeth; and vitamin K2 as MK-7 (from chickpeas) to promote the healthy transport of calcium into the bones, activate vitamins A and D3, and help optimize calcium utilization.