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where do b12 injections go at Home - Safety Guide for Self-Administration How to self-inject intramuscular vitamin
Description
However, a study found that taking 1,000 mcg of B12 by mouth or injecting the vitamin achieved similar results in treating the deficiencies

Excessive B12 can cause restlessness or a sudden spike in alertness in sensitive individuals
not for those sensitive to caffeine, pregnant/nursing women, or children under 18

"Low plasma vitamin B12 in pregnancy is associated with gestational 'diabesity' and later diabetes"