are b12 injections worth it The Shot: What Every Human Needs to Know About Injectable Vitamin B12 B12 Injection – When Is

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Vitamin B12 side effects Side effects from vitamin B12 supplementation are rare, and only occur with B12 injections, not oral supplementation, Allen says

Inherited genetic mutations can impact enzymes involved in vitamin B12 metabolism, potentially leading to deficiency anemia

Journal of Clinical Pharmacology, 63(12), 1121-1130

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High doses might also possibly interfere with levels of other vitamins, enzymes and minerals, which is always a potential problem when taking any nutrient in very large quantities