10 Foods Loaded with Vitamin K2 In the 1930’s, Dr. Weston A. Price discovered an unidentified nutrient which he deemed ‘Activator X.’ This fat soluble nutrient was found in grass-fed dairy, pastured meats, and traditionally fermented foods. Dr. Weston A. Price came to the ultimate conclusion that ‘Activator X’ is an incredibly important nutrient that is absolutely vital for abundant health and wellness. Years later, modern science has named this nutrient vitamin K2.