L-Homocysteine (Standard) is the analytical standard of L-Homocysteine. This product is intended for research and analytical applications. L-Homocysteine, an amino acid, is a homocysteine that has L configuration. Homocysteine is an essential intermediate in normal mammalian metabolism of methionine. L-Homocysteine induces upregulation of Cathepsin V that mediates vascular endothelial inflammation in hyperhomocysteinaemia[1][2].