Vitamin B6

Like other B vitamins, vitamin B6 functions as a coenzyme, which means it must be present for enzymes to activate chemical processes. Its used by more than 100 enzymes, many of which metabolize protein. Vitamin B6 must be present for the creation of serotonin, a neurotransmitter that helps regulate mood and sleep. It also converts an amino acid, homocysteine, into other beneficial substances, which is important because high levels of homocysteine are associated with an increased risk of cardiovascular disease.