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Hematocrit, reticulocyte count, vitamin B 12 , folate, and iron levels should be obtained prior to treatment
The NIH factsheet explains that no tolerable upper intake level has been set for B12, because it has a low potential for toxicity in healthy people
Injections may incur higher costs due to clinic visits and professional administration
Understanding these warning signs helps determine the right supplementation approach, from targeted B12 shots to comprehensive IV infusions
It is not a peptide, and there is no injectable form with established safety data oral is the right route
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