Common side effects include, but may not be limited to: _ pain or soreness at the injection site mild diarrhea nausea upset stomach Serious side effects may include: signs of an allergic reaction The most serious side effect of Vitamin B complex injections is an anaphylactic shock
Some patients may experience mild redness or tenderness at the injection site
Salinas et al 27 The traditional treatment of vitamin B 12 deficiency is the intramuscular injection of cyanocobalamin, generally, 1 mg/d for 1 week, followed by 1 mg/wk for 1 month, and then 1 mg every 1 or2 months ad perpetuum
"Conclusions of a WHO Technical Consultation on folate and vitamin B12 deficiencies"
It gives you clean, round numbers for standard doses easy to measure, hard to mess up
Depending on the injection, it might include other B vitamins