My doctor told me to take vitamin K to stop the heavy bleeding during menstruating. I researched foods that have a high content of it in it. I tried collard greens. They also have several other good vitamins too. After eating 1/4 cup about three times a day. I noticed l was not having to change so often or set my alarm clock at night to prevent an accident. I learned to cook them myself for taste and controlling the amount of sodium. Better than canned for me because the heavy sodium gives me cramps on my heaviest day. A true miracle for me. Fresh collard greens works better for me than the vitamin K pills.