Coumadin /warfarin interacts with foods that contain
Vitamin K.
Vitamin K works against Coumadin /warfarin and makes it less effective. Please try to eat consistent amounts of Vitamin K. Green leafy vegetables such as spinach, broccoli, kale, collard greens, cabbage, and salad greens are some sources of Vitamin K, but there are many others. If you are taking salad every day or other foods rich in Vitamin K, you must eat similar amounts each week.