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Thick blood may also be caused by the presence of harmful pathogens such as fungi, viruses, bacteria, and parasites. These pathogens can actually activate a coagulation response in the body as a way to avoid being attacked by the bodyâs immune system.
Close-up of an assortment of vitamins. Photo Credit manu10319/iStock/Getty Images. Your body maintains a delicate balance with your blood to ensure you have enough blood and that it is not too thick or too thin. Over time, excess cholesterol or clotting factors in your blood can make your blood thicker and more likely to clot -- an occurrence that can lead to a heart attack or stroke. While your physician may prescribe medications to thin the blood, certain vitamins also have been shown to have blood-thinning effects.