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Self-administered B12 shots are generally recommended for individuals: whose bloodwork has documented low B12 levels Patients with pernicious anemia or a lack of intrinsic factor Individuals with Crohn's disease, celiac disease, or post-bariatric surgery malabsorption Vegans and strict vegetarians are unable to correct the deficiency through diet Older adults whose stomach acid production has declined with age Anyone on long-term metformin or proton pump inhibitors Across most of the U.S., injectable B12 is not sold over the counter a clinician has to write the script before a pharmacy can dispense it
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Excessive powder loads may cause patient discomfort, nasal dryness, irritation, and increased mucociliary clearance or sneezing, which can compromise dose deposition and reproducibility (Chung et al., 2023
There was extra in the bottle Ive lost weight and met my goals
So injecting near the injury doesn't give you any extra benefit, and going intramuscular instead of subcutaneous just adds discomfort for no real upside
10.1016/j.bbagen.2012.10.018 Biochim
