can you take too many b12 injections get much vitamin injection B12 vs. Oral Supplements: Which Is Better? Vitamin B12 Overdose: How Much

Peterson JC and Spence JD (1998)

A discrepancy of the arterial oxygen saturation between measured by pulse oxymeter (SaO2) and measured by blood gas analysis (SpO2) reminds physician of methemoglobinemia

Standard prenatal multivitamins in the UK generally contain between 2.5 and 10 micrograms of B12, which may be sufficient for women with adequate dietary intake but insufficient for those with established deficiency or malabsorption

As of now, long-term safety data is not available

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Mild symptoms present with tremors, nausea, vomiting, diarrhea, dilated pupils, and increased sweating