It declines with age, and lower NAD+ is associated with slower metabolism and the changes we lump together as getting older. NNMT, meanwhile, consumes the raw materials your body uses to make NAD+ and in fat tissue, NNMT is often overexpressed, which can drag NAD+ down right where you least want a sluggish metabolism
Subsequent elevations in NAD+ levels activate sirtuin 1 (SIRT1), a cellular regulatory enzyme dependent on NAD+ availability
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"Anaerobic synthesis of vitamin B12: characterization of the early steps in the pathway" (PDF)
If you decide to undertake self-injection, always consult a nurse practitioner or doctor to learn the proper method of identifying and cleaning the injection site, administration and how-to properly open the ampules
"Vitamin B12 Deficiency Anemia"