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In December 2024, the FDA's Pharmacy Compounding Advisory Committee declined to include it on the 503A bulk drug substances list, meaning compounding pharmacies in the United States cannot legally produce it for individual prescriptions

That's how you generate reproducible, publishable data rather than ambiguous results that raise more questions than they answer

The onset of B12 deficiency can be subtle, often starting with symptoms that mimic everyday stress or fatigue

The numbers below come from two places: rodent studies scaled to a human size (allometric scaling) and several years of research community use reports