Adequate calcium and vitamin D throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis. Osteo-K® provides additional nutritional support by combining calcium and D3 + K2 MK4®. To meet the people's unique nutritional needs, NBI created three versions of Osteo-K: original Osteo-K for those who need more calcium, Osteo-K Minis with less calcium, and calcium-free Osteo-MK4®. If you're unsure which product is right for you, click here. Maintains strong bones Supports healthy bone density and bone matrix Promotes healthy bone marrow Supports healthy immunity and healthy inflammation balance Activates genes that produce healthy bone collagen In addition to providing 1000 mg/day of calcium (as calcium citrate) and 2000 IU/day of vitamin D3, Osteo-K also delivers 45 mg/day of MK4.