GlyNAC: The Most Promising Anti-Aging Supplement, but Most people Shouldn’t use it

Physionic

Feb 26, 2026

Episode description

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0:00 - Introduction
0:55 - Murmurings of Benefit
3:56 - Realized Potential in Humans
5:40 - Incredible Results
7:56 - I was Right in 2023
10:19 - Useless for Most...

References
[Study 117] Kumar P, Osahon OW, Sekhar RV. GlyNAC (Glycine and N-Acetylcysteine) Supplementation in Mice Increases Length of Life by Correcting Glutathione Deficiency, Oxidative Stress, Mitochondrial Dysfunction, Abnormalities in Mitophagy and Nutrient Sensing, and Genomic Damage. Nutrients. 2022;14(5):1114. Published 2022 Mar 7. doi:10.3390/nu14051114

Funding/Conflict : Public: none reported; Non-Profit: internal institutional funding from Baylor College of Medicine supported this pilot project; Industry: no industry funding reported; Conflicts of interest: the authors state that they have no conflicts of interest.

[Study 118] Kumar P, Liu C, Hsu JW, et al. Glycine and N-acetylcysteine (GlyNAC) supplementation in older adults improves glutathione deficiency, oxidative stress, mitochondrial dysfunction, inflammation, insulin resistance, endothelial dysfunction, genotoxicity, muscle strength, and cognition: Results of a pilot clinical trial. Clin Transl Med. 2021;11(3):e372. doi:10.1002/ctm2.372

Funding/Conflict : Public: no public or governmental funding was reported; Non-Profit: the study was supported by a philanthropic gift from the McNair Medical Institute at the Robert and Janice McNair Foundation in Houston, Texas, USA; Industry: no industry or commercial funding was reported; Conflicts of interest: the authors report that none of them have any conflicts of interest to disclose.

[Study 119] Kumar P, Liu C, Suliburk J, et al. Supplementing Glycine and N-Acetylcysteine (GlyNAC) in Older Adults Improves Glutathione Deficiency, Oxidative Stress, Mitochondrial Dysfunction, Inflammation, Physical Function, and Aging Hallmarks: A Randomized Clinical Trial. J Gerontol A Biol Sci Med Sci. 2023;78(1):75-89. doi:10.1093/gerona/glac135

Funding/Conflict : Public funding: R01AG041782 from the U.S. National Institutes of Health / National Institute on Aging was awarded to R.V.S. to support this work; Non-profit funding: a philanthropic research gift to R.V.S. from the McNair Medical Institute at the Robert and Janice McNair Foundation in Houston, Texas provided additional support; Industry funding: no industry funding was reported; Conflicts of interest: the authors state that these funders had no role in the trial conduct, data analysis, result interpretation, or manuscript preparation, and that no conflicts of interest were declared.

[Study 638] Sekhar RV. GlyNAC (Glycine and N-Acetylcysteine) Supplementation Improves Impaired Mitochondrial Fuel Oxidation and Lowers Insulin Resistance in Patients with Type 2 Diabetes: Results of a Pilot Study. Antioxidants (Basel). 2022;11(1):154. Published 2022 Jan 13. doi:10.3390/antiox11010154

Funding/Conflict : Public: none reported; Non-Profit: seed funding from Baylor College of Medicine to the author (R.V. Sekhar) supported this work; Industry: no industry or commercial funding was reported; Conflicts of interest: the author states that there are no conflicts of interest.

[Study 639] Kumar P, Osahon OW, Sekhar RV. GlyNAC (glycine and N-acetylcysteine) supplementation in old mice improves brain glutathione deficiency, oxidative stress, glucose uptake, mitochondrial dysfunction, genomic damage, inflammation and neurotrophic factors to reverse age-associated cognitive decline: implications for improving brain health in aging. Antioxidants (Basel). 2023;12(5):1042. doi:10.3390/antiox12051042

Funding/Conflict : Public: none reported; Non-Profit: this project received philanthropic support from the McNair Medical Institute at the Robert and Janice McNair Foundation; Industry: no industry or commercial funding was reported; Conflicts of interest: the authors declare that they have no conflict of interest.

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Disclaimer: None of the information provided by this brand is a replacement for your physician's advice. This brand is information for the sake of knowledge and the options of choice it provides, not in any way a personalized prescription. Please consult your physician before making any health related changes.

Mindsip insights from this episode:

Restore youthful glutathione levels with GlyNAC

In older adults, GlyNAC can increase glutathione levels to be similar to those of people five decades younger.

Consider 2 grams daily of GlyNAC for effective dosing

While studies use very high amounts, an estimated effective dose could be a more manageable 2 grams per day of both glycine and N-acetylcysteine.

Enhance physical function with GlyNAC beyond cellular metrics

Beyond cellular metrics, GlyNAC provided remarkable improvements in physical function, including gait speed and grip strength, in just 16 weeks.

Consider GlyNAC supplementation if over 60 or facing chronic health issues

GlyNAC supplementation is likely only beneficial for older individuals (around 60+) or younger people with chronic health issues like type 2 diabetes.

Exercise caution until GlyNAC trials are replicated

All human randomized controlled trials on GlyNAC have been conducted by a single laboratory, which calls for caution until the results are replicated.

Avoid GlyNAC if young and healthy

Limited evidence indicates that GlyNAC is not worth it for younger, healthy people as it doesn't appear to raise their glutathione levels.

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