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(Source 1, 2) Because vitamin B12 is a helper, or cofactor, for these enzymes, it becomes necessary for important body functions including: The synthesis of red blood cells The production of the myelin sheath, a fatty coating that protects nerve cells DNA synthesis and expression Cellular energy production Central nervous system function Growth and development (Source 1, 2, 3) Vitamin B12 Food Sources and Daily Requirements Vitamin B12 is bound to protein in all animal products, including meat, dairy products, fish, shellfish, eggs, poultry and organ meats

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The ratios between the three ionized forms of analytes were slightly different in the two mass spectrometers due to minor differences in the source conditions

PMID: 32983753

For providers and patients, it reflects an evolving regulatory landscape that may shape how these therapies are sourced and prepared, including the role of licensed pharmacies