Vitamin KThorne's Vitamin K contains three clinically studied forms of vitamin K vitamin K1, and two forms of vitamin K2 (MK 4 and MK 7). It contains significantly more MK 4 than most other multiple K products on the market. Sonoran University Medicinary recommends consulting with your doctor or alternative healthcare professional before beginning a new supplement or herbal remedy. These statements have not been evaluated by the Food and Drug administration.