What to watch with VKORC1 and Müdigkeit?

VKORC1 encodes an enzyme that recycles vitamin K and determines sensitivity to anticoagulants like warfarin. Fatigue is not a direct effect of VKORC1 variants, but can arise indirectly: if you take warfarin, certain VKORC1 polymorphisms increase sensitivity, raising bleeding risk and potentially causing anemia-related fatigue. Vitamin K deficiency (rare) could also contribute to tiredness. Evidence for a direct VKORC1–fatigue link without medication is weak. If you are on warfarin, monitor INR regularly and discuss fatigue with your doctor. If you only have genetic data and no anticoagulant therapy, no specific action is needed. Be cautious with vitamin K2 supplements (e.g., in D3+K2 products) as they can counteract warfarin. Evidence: strong for warfarin dosing, weak for fatigue as a standalone symptom.