There are a number of herbs and spices that act as natural blood thinners.
Many foods that people use regularly, such as cayenne pepper, contain substances that thin the blood. Foods that contain salicylates, omega-3 fatty acids, high vitamin E content, or natural antibiotics are all natural blood thinners. It is important to talk to your doctor before taking any of these supplements, especially if you are on a medication to thin blood such as Coumadin. If you are going to have surgery, let your doctor know what you are taking. Often they will want you off the supplements for at least two weeks before your surgery date.
Cinnamon supplements will thin the blood but sprinkling it on toast won't hurt you.
Dill is not well known as a blood thinner but can interact with certain medications if taken in large doses.
Garlic has been used for centuries for it's healing qualities.
Although ginger is most often used to combat nausea, it is also a strong blood thinner.
Ginko increases circulation as well as guarding against clotting.
Licorice root, not the candy, has been used for its blood thinning capabilities.
St. Johns Wort can react with certain medications, thinning the blood to dangerous levels.