Nutrition and Supplements Vitamins and minerals Nature's Plus Vitamin D3 and Vitamin K2 - 90 Capsules Vitamin D is necessary for the growth and strength of bones, and works synergistically with calcium and phosphorus, improving their absorption. It is a fat soluble vitamin. It can be ingested with food or manufactured by the body as a result of the incidence of sunlight on our skin. People with little exposure to sunlight may need to supplement their diet with an extra supply of vitamin D. Vitamin K is also involved in bone wellness. It is essential to allow the flow of calcium from the bloodstream to reach the bones and bone marrow. It has been related to osteoblasts, the cells that generate bone tissue and is essential to produce and activate osteocalcin, a specific protein that favors the fixation of calcium in bones.