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A B12 injection goes straight into the muscle, so your body gets what it needs fast
What Are The Four Stages of B12 Deficiency
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Oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less in people with low intrinsic factor, atrophic gastritis, or gut absorption issues
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Even in people without overt deficiency, B12 injections can correct subclinical insufficiency more rapidly than oral supplementation
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