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D51.0 - Vitamin B12 deficiency anemia due to intrinsic factor deficiency: Intrinsic factor is essential for Vitamin B12 absorption, and its deficiency can lead to a specific type of anemia related to Vitamin B12 deficiency
This is rare, but better to be safe
While oral administration peaks at approximately 220-300 micromoles per liter due to intestinal transport saturation, vitamin C injections can achieve concentrations exceeding 15,000 micromoles per literrepresenting a 70-fold increase over oral bioavailability
The short answer: yes
The tradeoff is speed: cortisone gives faster symptom relief
If you are 65 or older, you are an excellent candidate for B12 injections because your body will likely be less able to process nutrients than it did when you were younger
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