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D50.9 applies to unspecified iron deficiency anemia
It also aids in producing neurotransmitters, which are chemicals that help communicate between neurons in the brain, improving brain function
For adults 60+, and especially anyone with reduced stomach acid, atrophic gastritis, post-bariatric surgery, or on metformin/PPIs, sublingual is the lower-risk default because at least some of the dose absorbs through the oral mucosa directly, bypassing the stomach
Vitamin preparation
Summary: Vitamin B12 injections for pernicious anaemia deliver hydroxocobalamin intramuscularly to bypass malabsorption caused by lack of intrinsic factor, rapidly correcting deficiency and preventing neurological damage