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However, the bioavailability of the B12 injection depends on the form used

Its activity intersects two major metabolic pathways simultaneously: the NAD+ biosynthesis pathway (by consuming nicotinamide, an NAD+ precursor, NNMT competes with the NAD+ salvage pathway) and the methyl-donor pathway (by consuming SAM, NNMT reduces the availability of methyl groups for epigenetic and metabolic methylation reactions)

Regarding FDA approval: because this is a compounded product, it is not directly FDA-approved

Following treatment, media was replaced with 80% (v/v) methanol (cooled to 80 C.) containing 500 nmol 6-chloronicotinamide (6-CN) as an internal standard (IS) to extract cellular metabolites