3-Fluoro-L-tyrosine is a medium supplement.

Pipecolic acid, a metabolite of lysine found in human physiological fluids such as urine, plasma and CSF, is an important regulator of immunity in plants and humans alike.

Levocarnitine propionate HCl is used to treat the deterioration of renal function, congestive heart failure, intermittent claudication, and other diseases.

Nitroarginine, or Nω-nitro-L-arginine, is a nitro derivative of the amino acid arginine. It is an inhibitor of nitric oxide synthase and hence a vaso-constrictor and coronary constrictor. As such, it finds widespread use as a biochemical tool in the study of nitric oxide and its biological effects. Nitroarginine has been used in research studying coronary constriction, in the presence of midazolam vasodilatation was unaffected by nitroarginine. Nitroarginine is currently in clinical trials for treating patients with advanced solid tumors.

Acetyl-L-carnitine facilitates the uptake of acetyl CoA into mitochondria during fatty acid oxidation, enhances acetylcholine production, and stimulates protein and membrane phospholipid synthesis. 

1-Aminocyclobutanecarboxylic acid is a NMDA receptor partial agonist acting at the glycine site, NR1.

L-Homocysteine, a homocysteine metabolite, is a homocysteine that has L configuration. L-Homocysteine induces upregulation of cathepsin V that mediates vascular endothelial inflammation in hyperhomocysteinaemia .

L-theanine is an amino acid found most commonly in tea leaves and binds to ionotropic glutamate receptors in the micromolar range, including the AMPA and kainate receptors and, to a lesser extent, the NMDA receptor.

3,4-DHP is an inhibitor of HRGP biosynthesis.

S-Allyl cysteine (SAC), a natural constituent of fresh garlic, has antioxidant and anticancer properties in animals.

H-HoSer-OH is commonly used in biosynthesis of methionine, threonine and isoleucine.