User 15 cited a general dosing range of 2.5 to 3.75mcg per kilogram of body weight twice daily, which, at higher body weights, still produces doses within the standard 250 to 500mcg range being used across the dataset
Serious Vitamin B12 deficiency can result in decreased number of red blood cells (anemia), stomach or intestinal diseases and permanent nerve damage
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If B12 is low, your oxygen supply can be affected
FDA reviewers have also cautioned that a peptide's similarity to a naturally occurring substance does not eliminate potential risks