how much b12 increases with one injection Vitamin shots: Uses, benefits, and side effects How Often To Get B12

That is more than most exercise sessions

Both methylcobalamin and hydroxocobalamin are delivered via injection, so they skip the gut and go straight to workno absorption issues, no waiting game

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The convenience factor shouldnt be overlooked either

Gastrointestinal issues: If youve been diagnosed with gastrointestinal disorders such as celiac disease or Crohns disease, or youve undergone gastrointestinal surgery, you may require B12 injections

For malabsorption (e.g., pernicious anemia), injections are often preferred, though some clinicians still use very high-dose oral regimens (NIH ODS)