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One major advantage of intramuscular injection is that its increasingly effective at raising blood levels of B12
NNMT (nicotinamide N-methyltransferase) is an enzyme that methylates nicotinamide, diverting it from NAD+ synthesis
This area is easy to reach and less likely to cause discomfort compared to more muscular injection sites
But just like with many highly effective agents, your body adapts over time
B12 deficiency has been associated with fatigue, low mood, and poor circulation , which can contribute to decreased sexual interest or performance
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