Ursocholic acid is a bile acid, used to study its specific activities that range from reduction of cholesterol absorpition, cholesterol gallstone dissolution to suppression of immune response.

Delta-Tocopherol is an isomer of Vitamin E with potential antioxidant activity.

Pyridoxylamine is an advanced glycation end production (AGEs) and lipoxidation end products (ALEs) inhibitor, to protect against diabetes-induced retinal vascular lesions.

6-Biopterin (L-Biopterin), a pterin derivative, is an oxidation product from the melanogenesis regulating cofactor (6R)5,6,7,8 tetrahydrobiopterin (6-BH4).

Cysteinylglycine is an endogenous metabolite and used in disease diagnosis.