Multivitamin and mineral blend: vitamins and minerals are required for the synthesis of neurotransmitters, and a significant body of literature over the past decades has supported a link between nutrients and mood (Kaplan et al, 2007)
Kaplan, et al, 2007, "Vitamins, Minerals, and Mood", Psychological Bulletin, 133(5), 747-760.
Sublette, M.E., Ellis, S.P., Geant, A.L., Mann, J.J., 2011. "Meta-analysis of the effects of eicosapentaenoic acid (EPA) in clinical trials in depression". J. Clin. Psychiatry 72(12), 1577–1584.