Most people are unaware of the importance of vitamin K for health. It works with various proteins, vitamins and minerals in our body to ensure our good health. Vitamin K is a fat-soluble vitamin that exists in two forms, vitamin K1 and vitamin K2. There is strong evidence that vitamin K promotes bone health and blood clotting, and these studies also show that vitamin K protects against high blood pressure and liver cancer, as well as improves memory in older adults. Vitamins K1 and K2 are found in different foods.