Homocystine is the double-bonded form of homocysteine but it occurs only transiently before being converted to the harmless cystathionine via a vitamin B6-dependent enzyme. Increasing evidence supports a role for an elevation of homocysteine in schizophrenia.

C20 Ceramide (N-Arachidoyl-D-sphingosine) is a 20:0 ceramide found in the brain that crosses the blood-brain barrier to activate microglia and induce depressive-like behavior.

(R)-Pantetheine (Pantetheine) is the biologically active form of VB5 (pantothenic acid), which occurs in nature in various forms of Pantetheine-containing ligands (PCL).