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While the IOM had based B12 needs on the amount required to correct hematological parameters for people with pernicious anemia, the EFSA had almost 20 more years of research to draw on, and concluded that the most suitable approach was basing needs on biomarkers (serum B12, holotranscobalamin, MMA, and homocysteine)

That difference shapes opened-vial dating from day one

Just as importantly, its regulatory status has tightened the FDA has moved to restrict its compounding which is exactly why it should only be considered under a provider's guidance, never sourced from an unregulated website

That distance is what the FDA's compounding rules are supposed to protect

They serve as the building blocks of proteins and play crucial roles in biological processes