Vitamin B6, also known as pyridoxine hydrochloride, is a water soluble vitamin that is naturally present in the food we eat. It is one of the several B vitamins required for the production of neurotransmitters, the chemicals responsible for sending out signals to the brain. In our brain, dopamine, serotonin and GABA are the three most important neurotransmitters that require vitamin B6 for synthesis. In addition, vitamin B6, in its coenzyme form, is involved in a vast variety of enzymatic reactions, mostly related to protein metabolism. Vitamin B6 is helpful for premenstrual and PMS syndrome and may relieve depression and discomforts caused by pregnancy.