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Sessions are typically brief, and the injection process is usually quick and well-tolerated

This can occur due to a genetic predisposition (vitamin B12 deficiency anemia is more prevalent in people with a northern European heritage or with a family history of this condition)

The boxed thyroid tumor warning, rare pancreatitis, gallbladder disease, and other risks apply regardless of dose, and some are contraindications

Vitamin B12 deficiency can affect anyone at any age, but certain groups are at higher risk

And theres more: Chronic administration of methyl B12 was shown to protect cultured retinal neurons against N-methyl-D-aspartate-receptor-mediated glutamate neurotoxicity