Mathew TK, Tadi P. Blood Glucose Monitoring. Grape seed extract may also act as a natural blood thinner. Cayenne peppers are also high in salicylates and may act as powerful blood-thinning agents. It may be safer to get vitamin E from foods rather than supplements. To get the anticoagulant effects of natural salicylates, people may want to use fresh or dried ginger regularly in baking, cooking, and juices.