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Homocysteine is an amino acid. Amino acids are the building blocks of proteins. When proteins break down, elevated levels of amino acids like homocysteine may be found in the bloodstream. Having elevated levels of homocysteine in the blood (hyperhomocysteinemia) is associated with atherosclerosis and blood clots. It is not possible to get homocysteine from the diet. It must be made from methionine, another amino acid that is found in meat, fish, and dairy products.
Proteins in your blood called fibrins work with small blood cell fragments called platelets, to form the clot. This is called coagulation, a process that helps the body when an injury occurs because it slows blood loss. After bleeding has stopped and healing has occurred, the body should break down and remove the clots. But sometimes blood clots form too easily or donât dissolve properly and travel through the body limiting or blocking blood flow. This is called excessive blood clotting or hypercoagulation, and can be very dangerous.