A randomized, double-blind, placebo-controlled in 129 young healthy adults found that taking a supplement that contained ten times the daily intake recommendations for nine different vitamins (vitamin A, thiamin, riboflavin, niacin, vitamin B 6 , folic acid, vitamin B 12 , vitamin C, vitamin E) for one year improved one self-assessment of mood, i.e., being more agreeable (137)
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Stephen Matta and Mary Anne Matta are not just practitioners
Preliminary research shows supplementation with L-carnitine positively affects acute physical performance, including increased power output and maximum oxygen consumption on the cellular level