why would you need b12 injections Benefits of for Optimal Health Feeling worse after B12 Injection:

As a selective substrate site-targeting inhibitor of nicotinamide N-methyltransferase (NNMT) the cytosolic enzyme responsible for the methylation of nicotinamide using S-adenosylmethionine (SAM) as a methyl donor 5-Amino-1MQ is studied as a tool compound for investigating NNMT enzyme activity, NAD salvage pathway interactions, and methylation pathway dynamics in controlled in-vitro experimental systems

Patients who have a severe deficiency will notice the results earlier than patients with a mild deficiency

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However, consult a doctor for the exact dosage you need

Standard Dosage : Usually contains a mix of B12, methionine, inositol, and choline

The fact that you have to go to your doctor to administer the injection, is another reason many people will choose supplements, rather than the injection form