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Intramuscular injections (typically given in the upper arm, thigh, or gluteal muscle) are common for vitamins and allow the biotin to be absorbed gradually into the bloodstream
Banks model predicts less CNS entry
The absorption profile differs slightly, with potentially faster uptake but similar overall bioavailability
Journal of Molecular Medicine , 2017
Mechanism of action Inhibits nicotinamide N-methyltransferase, raising NAD+ pools
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