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With the COVID-19 vaccine specifically, patients typically experience pain, redness and swelling in the arm where they get the vaccine

Researchers also report that the peptide has not caused any serious side effects in the few clinical trials performed up to date

Additionally, inhibition of NNMT using MNAM resulted in a decline in performance during anaerobic endurance exercise in rats (Zhou et al., 2018)
NAD+ metabolism and its roles in cellular processes during ageing