Vitamin D is a fat-soluble vitamin naturally present in very few food sources. It is the same form of vitamin D the body produces when skin is exposed to sunlight. Vitamin K refers to a family of fat-soluble compounds known as quinones. Vitamin K2 (menaquinone) is produced by bacteria in both animal and human intestines. Vitamin D is known to help fight off pathogens and support upkeep of the immune system. Vitamin D supports the body in absorption of calcium and phosphorus, essential minerals for healthy muscle function. The blend of D3 with K2 directs it to areas of your body such as your bones, so it can be put to good use. Vitamin K2 is essential in the avoidance of calcium deposits in the arteries and blood vessels by helping the circulation and binding of the calcium to strengthen bones. This one a day formula is both 100% vegan and easy to swallow.