how does the body process b12 injections Shots vs. IV Infusions: What is difference? Best Vitamin B12 Injection Sites
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Research shows daily doses of 300-900mg NMN over 60 days boost blood NAD+ levels by a lot

Heres the lowdown on what not to do after a B12 injection : What Not to Do After Getting A B12 Injection 1

Additionally, MNAM has a low permeability to the membrane, which is crucial for achieving the desired therapeutic effect of the drug (Neelakantan et al., 2018)

2009 Jun 29;183(2):82331