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Description
[14] Serious systemic side effects have not been reported

They measure how much B12 functions in the cells

10.1038/srep26933 143 TripathiB

classified as FDA Pregnancy Category C

In addition, if you're one the millions of Americans taking proton pump inhibitors, known as PPI's, that suppress stomach acid for conditions like acid reflux, you're going to be prone to Vitamin B12 deficiency
