How does eating leafy greens effect the Coumadin (warfarin) level in a person on coumadin (warfarin)?

Lowers INR. If you eat spinach, turnip greens, broccoli, brussels sprouts, parsley or other leafy greens, this may counteract the effect of Coumadin (warfarin) on blood clotting, making your blood thicker and lowering your inr. If you like leafy greens, you should eat a consistent amount each week and titrate your Coumadin (warfarin) dosage based on that.