Interaction Checker
Check interactions
Add your supplements, foods, meals — and any medications you take — to see how they interact. Findings are grouped by severity: what to avoid, what needs care or timing, and what actually works better together.
Vitamin K2
Add more (1/12)
Avoid
1 · Don't combine without medical guidanceAvoid
Vitamin K2Warfarin (Coumadin)
Vitamin K2 counteracts warfarin and can reduce its anticoagulant effect.
Why: Vitamin K regenerates clotting factors warfarin suppresses.
→ Only under prescriber guidance with INR monitoring.
Curated
Caution
2 · Combine carefully — read the noteCaution
Vitamin K2Warfarin and other coumarin anticoagulants—may reduce anticoagulant effect; consistency is key
Vitamin K2: Warfarin and other coumarin anticoagulants—may reduce anticoagulant effect; consistency is key
Known interaction
Caution
Vitamin K2Some antibiotics (broad-spectrum) may reduce K2 production by gut bacteria
Vitamin K2: Some antibiotics (broad-spectrum) may reduce K2 production by gut bacteria
Known interaction
Not medical advice. This tool surfaces well-established and known interactions from our reference data and curated rules. It is not exhaustive, can’t see your full health picture, and an absence of findings does not mean a combination is safe. Always consult a doctor or pharmacist about your supplements and medications.
