HOMOCYSTEINE.

Overview

Homocysteine is a key intermediate in sulfur-amino acid metabolism, linking the methionine and folate cycles. Elevated homocysteine levels are associated with cardiovascular risks and can result from genetic defects or deficiencies in vitamins B6, B12, and folate. Conditions like homocystinuria arise from metabolic errors, such as cystathionine beta-synthase deficiency, leading to abnormal accumulation of homocysteine.