optimum strength vitamin d3 supports immune function,vitamin d for the normal absorption & utilisation of calcium/phosphorus & normal blood calcium levels,vitamin d helps to maintain normal bones and teeth,additional support for bones from vitamin k2 mk-7,excellent choice to support bone health & immunity throughout the yearmodern diets generally don't provide enough vitamin d3 and k2. you can now optimise your intake with our high-strength, broad-spectrum formula that comes in a convenient and flexible dose an excellent choice for those who want to support their bone health and immunity. each easy-to-swallow, taste-free capsule provides an impressive 25μg (500%) vitamin d3 and 90μg (120% nrv) vitamin k2, both of which work synergistically in the body and contribute to the maintenance of normal bones.