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doi: 10.1007/s40263-022-00907-3

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Here's what the cited research actually covers: Nicotinamide Riboside - human supplementation review: a 2023 review in the Journal of Gerontology (PMID 37068054) describes NR as one of the most-studied NAD+-boosting compounds, while noting mixed results across human trials on metabolic outcomes Nicotinamide Riboside - Parkinson's disease trial: a 2022 randomized trial in Cell Metabolism, the NADPARK study (PMID 35235774), found NR supplementation raised NAD+ levels in people with Parkinson's disease - a clinical Parkinson's population, not general wellness use, so it doesn't speak directly to healthy-aging claims made for a general audience NMNH - precursor comparison: a 2021 paper in Aging Medicine (PMID 34553119) compares different NAD+ precursor compounds and their relative effects on raising NAD+ levels, describing NMNH as one candidate among several under investigation All of this research used oral administration

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The same studies can be located independently on PubMed using the CAS number (137525-51-0) or the compound name