I've recently read that Niacin (B3) helps to regulate or enhance your metabolism. Can anyone recommend a good dosage to start, assuming I'm healthy otherwise?I'd love to have a little more pep in my step without resorting to even more caffeine or whatever else is out there!Or any other vitamin supplements someone can recommend? I wouldn't say I'm chronically fatigued, per se, but who couldn't use some extra energy/vitality/whatever-you-wanna-call-it?Any and all help is appreciated!