Health. Nature. Life. Advanced Formula Full Spectrum Complex With Vitamin K1 and Two Forms of K2 Dietary Supplement BPA Free Structurally similar, vitamin K is a set of fat-soluble vitamins that includes two vitamers: vitamin K1 and vitamin K2. While both vitamers are beneficial to the body, vitamin K2 remains biologically active in the body longer than vitamin K1. Futurebiotics Vitamin K Triple Play is designed to provide the benefits of both vitamin K1 and vitamin K2, plus it supplies two different forms of vitamin K2: Menatetrenone-4 (MK-4) and Menaquinone-7 (MK-7).