Nicotinamide riboside research
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Nicotinamide Riboside Research: NAD+ Precursor and Health Benefits
Nicotinamide Riboside and NAD+ Metabolism
Nicotinamide riboside (NR) is a form of vitamin B3 and a precursor to nicotinamide adenine dinucleotide (NAD+), a molecule essential for energy metabolism and cellular health. Research shows that NR is orally bioavailable in both humans and animals, and supplementation can significantly increase NAD+ levels in blood and tissues, with dose-dependent effects observed in clinical trials Trammell2016Airhart2017Martens2018. NR is considered superior to other NAD+ precursors in terms of pharmacokinetics and bioavailability Trammell2016Martens2018.
Safety and Tolerability of Nicotinamide Riboside
Multiple human studies have demonstrated that NR supplementation is generally safe and well-tolerated, even at relatively high doses (up to 2000 mg per day) over several weeks Dollerup2018Airhart2017Martens2018. No serious adverse events or significant safety concerns have been reported in these trials Dollerup2018Airhart2017Martens2018.
Effects on Metabolic Health and Disease
Metabolic Disorders and Insulin Sensitivity
While animal studies have suggested that NR may improve insulin sensitivity and reduce liver fat in models of obesity and type 2 diabetes, human clinical trials have not consistently shown improvements in insulin sensitivity, glucose metabolism, or body composition in obese, insulin-resistant men . Reviews of human studies indicate that, so far, NR supplementation has shown few clinically relevant effects on metabolic health, though some potential exists for reducing inflammation .
Cardiovascular and Neurodegenerative Diseases
NR has been studied for its potential benefits in cardiovascular and neurodegenerative disorders. Evidence from animal and early human studies suggests that increasing NAD+ through NR supplementation may help treat or prevent these conditions, but more research is needed to confirm these effects in humans Mehmel2020Sharma2022Biță2023. Some studies have noted possible reductions in blood pressure and arterial stiffness in older adults, warranting further investigation .
Anti-Inflammatory Effects and Aging
NR supplementation in older adults has been shown to increase NAD+ levels in skeletal muscle and reduce circulating inflammatory cytokines, suggesting anti-inflammatory benefits and potential for healthy aging Elhassan2019Martens2018Biță2023. These findings support the idea that NR could play a role in promoting longevity and reducing age-related decline .
Synthesis, Stability, and Supplementation Challenges
NR can be synthesized efficiently using engineered bacteria, and new methods are being developed to improve its production and stability . However, NR is a reactive and unstable molecule, which poses challenges for manufacturing, transport, and storage. Recent advances, such as the development of NR borate, have improved its stability for use as a dietary supplement .
Conclusion
Nicotinamide riboside is a promising NAD+ precursor with proven ability to raise NAD+ levels in humans and animals. It is safe and well-tolerated, with potential benefits for aging, inflammation, and possibly cardiovascular and neurodegenerative diseases. However, current human studies show limited effects on metabolic health, and more research is needed to fully understand its therapeutic potential and optimize its delivery as a supplement Mehmel2020Sharma2022Dollerup2018+7 MORE.
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