Vitamin K 1 article

Two broad forms define the vitamin K family: phylloquinone, known as K1, and a group of menaquinones commonly called K2. Leafy greens are major sources of K1, while some fermented foods contain menaquinones; supplements may use one or more defined forms. Nutrition discussions should keep vitamin K1, individual K2 forms, and total vitamin K conceptually separate, especially when comparing foods or supplements with different sources and formulations.