Some pharmacokinetic studies suggest that only around 1.52.5 g of B12 is absorbed from food per meal, while approximately 5% of a 25 g dose and only 1% of a 1,000 g oral dose is effectively absorbed (Devi et al., 2020
Dietary intake: Vegetarians, vegans, and those who limit their daily consumption of animal products may have to consume more vitamin B12, as it is mainly present in foods of animal origin
FASEB journal, 25(3), 907915
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Add 2 ml of bacteriostatic water to the 50 mg vial
High vitamin B12 levels are generally not harmful in individuals with normal kidney function, as there are no known adverse effects of excess B12 in those with proper renal function