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Preclinical studies in flies demonstrated that supplementation with NR or NMN improved mitochondrial respiration and membrane potential, and exercise endurance was improved 304,305
However, absence of extensive research on newer variants does not mean they are ineffective, just less studied
According to the NIH, common doses range from 3 milligrams (mg) to 5,000 mg daily, with an average 14% to 18% uptake rate
doi:10.1038/emboj.2011.105, PMID: 21478822 Trachootham D, Lu W, Ogasawara MA, Nilsa RD, Huang P (2008) Redox regulation of cell survival
Blood-brain barrier crossing is unconfirmed for peripherally administered DSIP