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Some people dont feel it at all

People with symptoms of vitamin B12 deficiency Vitamin B12 deficiency can lead to Anemia, Depression, Fatigue, Lethargy, and Numbness in the hands and feet

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10.1016/0378-4347(87)80104-4 129 ShibataK.KawadaT.IwaiK

Studies show REV-ERB and REV-ERB nuclear receptors control circadian rhythm and metabolic genes
