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According to the NIH Office of Dietary Supplements, vitamin K2 has low levels of toxicity and there are no reported side effects of vitamin K2 supplements.
However, there is a risk of vitamin K2 supplements interfering with your ongoing medications. If you already using any of the following drugs, you ought to consult your doctor before adding K2 supplements to your diet.
- • Anticoagulants such as warfarin, tioclomarol, phenprocoumon, and acenocoumarol
- • Weight-loss aids such as orlistat
- • Cholestyramine, colestipol, and other such bile acid sequestrants used to reduce cholesterol levels
- • Antibiotics *
