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Using plain sterile water may work short-term, but it lacks the preservative properties needed for multi-use and longer storage

For people who have trouble absorbing B12, this may be the best way to receive the vitamin

The clinical trials that showed disappointing results used oral administration

1 2 Appl Microbiol Biotechnol

NMN at 250 mg/day for 12 weeks significantly increased NAD+ metabolites and improved physical performance (Yoshino et al., 2021)
Differences in P-glycoprotein activity in human and rodent bloodbrain barrier assessed by mechanistic modelling
