Vitamin C is a co-factor in the normal production of serotonin, the body’s “happy” hormone. Co-factors are essentially “ingredients” required in the creation of and end product, in this case, serotonin. One of the best-established functions of vitamin C is in the regulation of neurotransmitter biosynthesis, including that of catecholamines dopamine, norepinephrine, and epinephrine. Vitamin C acts as a cofactor for the enzyme dopamine β-hydroxylase, which converts dopamine to norepinephrine