Its unapproved status with the FDA means there is no conclusive consumption measure
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Although rare, adverse effects of high-dose vitamin B12 have been reported, including allergic reactions such as fever, rash, itching, hot flushes, dizziness, and nausea, across all cobalamin forms and administration routes ( Intramuscular (IM) injection is the most invasive and costly administration method, requiring trained personnel and clinical visits
Vitamin B12 is water-soluble, which means excess amounts are usually excreted in urine
Taking Control With At-Home Testing The best way to get the data you need without playing the waiting game is with an at-home test