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side effects of injection vitamin b12 (Common and Serious) Potential Vitamin B12 Injection Side
Description
However, this does not mean it is not safe

StatPearls (US source) states, Patients generally receive lifelong intramuscular (IM) injections of vitamin B12 (typically 1000 g per month)

Certificate information is lot-specific

Most people who eat meat, fish, eggs and dairy products get enough B12