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Advanced Orthomolecular Research Peak K2 is menatetrenone (MK-4), a form of vitamin K2 produced in the body from phylloquinone (vitamin K1) and distinct from the menaquinones made by probiotic bacteria.
Research indicates that vitamin K2–especially menatetrenone–is superior to vitamin K1. Clinical trials have shown that high-dose vitamin K2 does not cause excessive or abnormal blood clotting, although it will interfere with blood-thinning medications.*