Vitamin A is an essential nutrient that supports immune function, reproduction, growth, and development. Vitamin D is also an essential nutrient found in every body tissue, with far-reaching health effects. Vitamin D supports bone, cardiovascular, respiratory, thyroid, immune, mood health, and much more. Vitamin K2, found in fermented foods such as natto, sauerkraut, hard cheeses, organ meats, and egg yolks, is necessary to help drive calcium into the bone. Vitamin D and K work synergistically to improve bone formation and support reduced risk for osteoporosis. ADK support overall immune health and may support a reduced risk for breast and colon cancer.