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How Fast Does a B12 Shot Work Compared to Oral Supplements Because B12 shots are administered intramuscularly and absorbed directly into the bloodstream, the nutrients bypass the slow digestive process

The favorable community experience provides context but cannot definitively answer the cancer safety question that only proper long-term human studies could address

The trade-off is accepting a wider uncertainty band around side effects

High-dose oral b12 (1000 to 2000 mcg daily) provides adequate absorption through passive diffusion even without intrinsic factor