Homocysteine: Its Possible Emerging Role in At Risk Population Groups New Insights into the Roles of Cysteine and Homocysteine in Pathological Processes IntechOpen Understanding Developmental Delays: Homocysteine Metabolism in Early Childhood Homocysteine is an amino acid. Vitamins B12, B6 and folate break down homocysteine to create other chemicals your body needs. High homocysteine levels may mean you have a vitamin deficiency. With a