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Vitamin B12 is a vitamin essential for many bodily functions, including energy production, brain function, and the formation of red blood cells

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Older pregnant individuals, as absorption efficiency decreases with age [*]

However, it is not FDA-approved for medical treatment or injection, and regulatory status may vary by use

This enzyme catalyzes the N-methylation of nicotinamide using S-adenosyl-L-methionine (SAM) as a methyl donor, effectively creating a "metabolic drain" that depletes both NAD+ precursors and cellular methylation capacity

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