Homocysteine Supplement Allergy Research Group Homocysteine is an inflammatory amino acid that is produced as a byproduct of protein metabolism. Homocysteine induced injury to the arterial wall is one of the factors that can initiate the process of Fitting homocysteine to disease models, as well as adjusting the models to the disease Journal of Molecular Medicine Springer Nature Link Homocysteine Supplement Allergy Research Group High homocysteine doesn't usually cause symptoms on its own, but it can signal vitamin deficiencies or other health issues and it's something you can check with a simple blood test