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The fastest way to increase B12 levels is through injections, especially if youre severely deficient or have trouble absorbing B12 from food

However, when very high oral doses are taken, approximately 1% can be absorbed through passive diffusion, independent of intrinsic factor, which explains how mega-doses can still raise serum levels

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Most patients begin to feel the benefits of the B12 shot within a few hours to a day, with results lasting up to a few weeks

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It also supports red blood cell production , helping oxygen circulate efficiently and reducing fatigue at its source