It has a larger body of long-term cardiovascular safety data
One study in men showed that NMN effectively increases blood NAD+ levels
[DOI] [PubMed] [Google Scholar] DeFronzo RA, Fleck PR, Wilson CA, Mekki Q, 2008
The kind of inflammation proposed to play a role in fibromyalgia occurs in the nervous system itself, and CRP measured in the blood doesnt reliably reflect whats happening in the brain or spinal cord
doi: 10.12659/AJCR.925020 279 TownsendD
The oral capsule format is of particular interest in this area, since the swallowed peptide is delivered directly into the gastrointestinal tract, where much of this research activity has historically been localised and where the compounds reported stability in gastric conditions is most relevant