Vitamin K can make Coumadin (a blood-thinning medication) less effective. When you take Coumadin, it helps to thin your blood to prevent clots. However, vitamin K is necessary for blood clotting.
If you consume a lot of vitamin K-rich foods (like leafy greens), it can counteract its effects. This makes it harder to control your blood's clotting ability.
To ensure Coumadin works properly, it's essential to maintain a consistent intake of vitamin K in your diet. If you have concerns, always talk to your doctor before making any changes.