Bioavailable Active Forms : D3 as cholecalciferol and K2 as MK-7—two of the most absorbable forms of these vitamins, ensuring your body utilizes every milligram for maximum benefit. Premium D3 + K2 (MK-7) Softgels | 10,000 IU D3 + 300 mcg K2 | 60 Servings | Bone, Heart & Immune Support.