With vitamin K2 – essential for optimum D3 absorption! On its own, vitamin D3 helps promote calcium absorption. Vitamin K2 helps ensure that the calcium is used where it’s needed in the body – like in the bones and teeth and not the arteries and kidneys, helping to discourage calcium buildup. Supports healthy cognitive and brain function and helps fight tooth decay. Vitamin D3 and Vitamin K2 liquid drops provides 1208iu of D3 and 25mcg of K2 per drop.