Supplement based on Vitamin D3, Vitamin K2 and Cod Liver Oil.\ Vitamin D3 plays a very important role in several bodily functions, including calcium absorption and bone mineralization. The synergistic action of vitamin D3 with vitamin K2 is widely demonstrated. Vitamin K2 complements the positive action of vitamin D, making some of the proteins activated by the vitamin more available. Instructions for use: Take 1 tablet a day with a glass of water.