Vitamins B6 For Nutritional Supplements Vitamin B6, also known as pyridoxine, includes pyridoxine, pyridoxal, and pyridoxamine. It exists in the form of phosphate esters in the body and is a water-soluble vitamin that is easily destroyed by light or alkali. High temperature resistance.  In 1936 it was named vitamin B6. Vitamin B6 is a colorless crystal, soluble in water and …