Since 1947 MK-7 from Natto Extract Gluten & Wheat Free Non-GMO Suitable for Lacto-Vegetarians Dietary SupplementVitamin K2 is an active form of Vitamin K and is important for bone health. Vitamin K2 is not readily found in the diet and is manufactured by gut microflora. Vitamin K2 can also be extracted from a natural whole food source, the fermented soybean product Natto, a natural source of MK-7.