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Sources of B-12 B-vitamins, including vitamin B-12, have been Researchers in a 2005 article published in the One possible connection is the effect of vitamin B-12 on the levels of serotonin in your brain, in addition to other chemicals

deamido-NAD + ), an intermediate in NAD + biosynthesis, was significantly reduced in patients with MMA compared with healthy controls

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doi: 10.1146/annurev-immunol-032713-120236 190 O'NeillLAKishtonRJRathmellJ