Once reconstituted, store at 2-8C and use within 30 days
As many as 24% of men and 29% of women reported taking a supplement (either a multivitamin that contains B12, a B-complex vitamin, or a standalone B12 supplement), according to the National Health and Nutrition Examination Survey (NHANES)
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For observational studies reporting serum vitamin B12 levels, the certainty of evidence was upgraded from low to moderate due to the large and consistent magnitude of effect across studies, despite heterogeneity
B12 does not stack: once your blood level is in the normal range, extra B12 is simply passed out in your urine rather than converted into more energy
This translates to roughly 2-4 additional pounds per month