This combination of vitamin D3, K2 and C plays a vital role in regulating immunity, and helps intestinal absorption. K2 helps reduce calcium deposits and lowers the risk for heart disease. Vitamin D is useful for healthy bones, immune system function, and for preventing depression and cancer. This combination also helps with type-2 diabetes and weight loss. Studies show that a combination of vitamin D and K2 is beneficial for bones, and with the addition of vitamin C helps protect against viral infections. 60 capsules.