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[DOI] [PMC free article] [PubMed] [Google Scholar] Teunis MA, Heijnen CJ, Cools AR, Kavelaars A (2004) Reduced splenic natural killer cell activity in rats with a hyperreactive dopaminergic system

The Pernicious Anaemia Society explained that people with the autoimmune condition don't have the necessary protein (intrinsic factor) to absorb vitamin B12

CRY-dependent plasticity of tetrad presynaptic sites in the visual system of Drosophila at the morning peak of activity and sleep

Varga V, Jenei Zs, Janky R, Saransaari P, Oja SS

So even the proposed mechanism does not predict an instant effect and none of this is human data