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Some individuals experience neurological or fatigue-related symptoms before lab values fall below the deficiency range
Common formulations include 5mg, 10mg, 15mg, and 30mg vials
Are there peer-reviewed human studies proving safety and benefit
B12 injections are contraindicated for individuals with Lebers hereditary optic neuropathy, severe kidney disease, known cobalt or cobalamin allergy, and polycythemia vera
These lasting benefits can persist for several weeks or months, especially when B12 shots are part of a regular supplementation routine
Some people can manage dietary B12 needs with food or tablets
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