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Both approaches are valid

Journal of Clinical Pharmacy and Therapeutics, 47(4), 543-556

While some places might market it for general energy boosts or weight loss, if your B12 levels are already normal, there's little scientific proof that these injections will give you a significant energy rush or help you lose weight

Butler et al.) This paper was published ten years ago and revolves around the fact that patients with Pernicious Anaemia should be able to passively absorb some B12 through their stomach around 1%

Comparative bioavailability and utilization of particular forms of B12 supplements with potential to mitigate B12-related genetic polymorphisms