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B12 injections are generally considered safe if youre deficient, and side effects are super rare

If I understand rightly you haven't an absorption problem.So once on supplements or a richer B12 diet you can store and utilise b12 from your liver

NNMT inhibition could have effects on methylation balance and other metabolic pathways that have not been evaluated in people

Hong S, Zhai B, Pissios P (2018) Nicotinamide N -methyltransferase interacts with enzymes of the methionine cycle and regulates methyl donor metabolism

Vitamin B12 is closely involved with the formation of a fatty substance around nerve axons called the myelin sheath