what are b12 injections given for Vitamin Injections: You Need To Know Vitamin Injections Explained: Benefits, Process

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Bacteria-derived hydroxocobalamin (OHCbl) and CNCbl are converted in humans to useful coenzyme forms to support metabolic processes such as mitochondrial methylmalonylcoenzyme A mutase conversion of methylmalonic acid (MMA) to succinate to link lipid and carbohydrate metabolism, and activation of methionine synthase, the rate limiting step in the synthesis of methionine

However, its important to understand that not all fatigue is caused by B12 deficiency

But B12 supplements don't seem to have any effect on people already at normal levels