Vitamin K directly counteracts warfarin (Coumadin). Keep intake consistent, not zero. Sudden changes affect INR levels. Check your supplement stack.
Vitamin K affects blood clotting; high doses can interact with warfarin and similar drugs.
| Standard | RDA | Upper Limit (UL) |
|---|---|---|
| US (FDA) | 120 mcg | 1000 mcg |
| EU (EFSA) | 120 mcg | 1000 mcg |
| AU (TGA) | 120 mcg | 1000 mcg |
RDA = Recommended Dietary Allowance. UL = Tolerable Upper Intake Level. Exceeding the UL long-term may cause the toxicity symptoms described above.
Yes. Vitamin K directly counteracts warfarin (Coumadin). If you take blood thinners, keep your vitamin K intake consistent day-to-day rather than avoiding it entirely. Sudden changes in vitamin K intake can affect your INR levels. Consult your doctor before taking vitamin K supplements.
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