isnt there an issue posted here about norepinephrine? maybe you posted it. are most people sympathetic deficient? arent there two modes, sympathetic and maybe para sympathetic? do orgasms raise para sympathetic dominance? what happens with excess norepinephrineYes. Vitamin C, ZMA, B-vitamins speed up the metabolism. They just boost the metabolism by improving thyroid, ATP generation as some (the B-vitamins mostly) are vital cofactors for ATP synthesis in krebs, ETC. Vitamin C is also a cofactor for norepinephrine synthesis (main sympathetic neurotransmitter). Zinc and some B-vitamins help lower prolactin. Excess zinc has the potential to lead to eventual copper deficiency through reduced absorption.