how soon do b12 injections take effect Long Does a Shot Last How Long Does a Vitamin

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14 Adults under 50: ~2.4 mcg per day Adults over 50: 2.4 mcg per day Older adults are advised to supplement with B12 where necessary due to the reduced stomach acid and intrinsic factor and/or medications

From a practical standpoint: Still no

This includes kids, older adults, pregnant and nursing moms, and those with kidney or liver problems

breast milk vitamin B-12 concentrations in our study were significantly higher in the vitamin B-12 group compared with the placebo group only at 6 wk postpartum, the time when supplementation ended