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Researchers frequently measure NNMT enzyme expression or activity, levels of nicotinamide-derived metabolites such as 1-methylnicotinamide, and metabolic markers associated with NAD pathways
Similarly, vitamin B12 levels above 900 pg/mL, especially without supplementation, may indicate some serious health complications, including diabetes, leukemia, or liver and kidney disease
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The largest concentration is found in offal (liver in particular) and then continues to decrease through lean meat to dairy products
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