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)
Concentration selection Starting concentration depends on your skin's sensitivity and previous experience with active ingredients
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The internal consistency and reproducibility of the IWQOL-Lite-CT were assessed using Cronbachs coefficient alpha, and weighted kappa statistics and intraclass correlation coefficients, respectively