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B12 injections bypass the digestive system and are absorbed directly into the body through the muscle, making them a good option for those with absorption issues

There is zero downtime with Vitamin B12 injections

Some people find that they prefer to have smaller quantities of B12 injected weekly or fortnightly, and others would rather take larger doses of B12 monthly

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

Vitamin B12 Intramuscular Dosage Guidelines Intramuscular B12 injections are often used for people with absorption problems