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Common side effects of vitamin B12 injections include mild diarrhea, itching, nausea and vomiting, dizziness, headaches, and hot flashes

doi:10.1007/s00441-019-03016-8 Chang CH, Tsai WC, Hsu YH, Pang JH

Andreeff M , Weidner DA, Wang RY, Zhao S, Kuenle I, Kantarjian H, Brenner MK, Goodell MA

Even some meat eaters can have trouble absorbing vitamin B12

Your body normally recycles it through several metabolic pathways that require nutrients like: Vitamin B6 Vitamin B12 Folate Serine Glutathione When those pathways work properly, homocysteine stays in balance

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