There are two types of prescription only vitamin B12 medicines that are listed in the British National Formulary (BNF) by NICE (National Institute for Health and Care Excellence) to be used for treating vitamin B12 deficiencies hydroxocobalamin and cyanocobalamin
And in most cases, they were not approved. According to the FDAs own website, the drug approval process is complex and time consuming, involving years of clinical trials, evaluation of research and inspection of facilities where the drugs will be manufactured
Blood , 103 (5), 15731579
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A peptide that patients have been sourcing as unregulated research chemicals now has a clearer path toward being compounded by a licensed pharmacy, with proper testing and a legitimate prescriber involved
The Food and Nutrition Board, the National Academy of Sciences-National Research Council recommend that lactating women should consume 4 mcg of vitamin B12 daily (11)