The recommended daily amount (RDA) varies, depending on age and other factors, but while the recommended dose for an adult is 2.4 mcg (micrograms), B12 vitamin pills are also sold in doses of 5 to 25 mcg, and even 500 mcg to 1,000 mcg or more
At a Glance: Procedure Time 15 minutes Discover B12 Shots Vitamin B12 plays a key role in many body functions
This reaction has been reported at a rate of five cases per million vaccine doses and usually develops quickly after administration
Kuceki, Wambier et al
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Possible long-term risks of vitamin B12 Most side effects of high doses of B12 are rare and temporary