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Oral supplements can be helpful, but theyre not as efficient as injections
Vitamin B12 is a vital nutrient that plays a significant role in the production of red blood cells, nerve function, and DNA synthesis
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If the mouse figure of 3.5% oral bioavailability holds in humans, 100 mg swallowed delivers roughly 3.5 mg systemically, which is why 100 mg oral and 5 mg subcutaneous end up as the two standard protocols
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