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PMID: 34444820

To get insurance, patients need: A confirmed B12 deficiency diagnosis A doctors prescription Proof that they really need it Differences Between Prescription and OTC Options Prescription B12 tablets, often with cyanocobalamin, are different from OTC ones

3.4 Changes in serum homocysteine by supplementation route and dosage Analysis of 10 comparisons showed that vitamin B12 supplementation was associated with a mean reduction of 35.8% in serum homocysteine concentrations (Supplementary Table S5)

There is a striking and concerning lack of human evidence

A newly identified peptide called CAQK takes a different approach entirely

These different amounts show how their potency levels vary