Study
Supplementing Cysteine and Glycine Reduces Oxidative Stress in Seniors
Taking cysteine and glycine can help restore important antioxidants in seniors, reducing oxidative stress significantly.
Summary
In plain language
Researchers have found that as we age, our bodies may produce less glutathione, a key antioxidant that helps protect against oxidative stress. This study discovered that by adding cysteine and glycine to the diet, seniors can significantly boost their glutathione levels. In the study, older adults who took these supplements saw a nearly 95% increase in glutathione and a marked reduction in oxidative stress. This means that simply adjusting your diet could help protect your cells and improve overall health. It's a promising approach that could make a big difference in maintaining vitality as we age.
Details
Use the full description to understand the study design, methods, and the limits of the findings.
The study involved a small group of healthy seniors and younger adults. Researchers measured the levels and production rates of glutathione, an antioxidant, in their blood. Seniors had lower levels compared to younger folks. After two weeks of taking cysteine and glycine supplements, their glutathione levels nearly doubled, and markers of cell damage decreased.
The study showed that seniors can improve antioxidant levels with dietary supplements.
Results showed a 94.6% increase in glutathione levels in seniors after supplementation.
Although promising, the study was small, so more research is needed to confirm these findings.
Seniors should talk to their healthcare providers about whether these supplements could be beneficial for them.
Full Study
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Supplementing Cysteine and Glycine Reduces Oxidative Stress in Seniors
Published April 2026
Opens at the publisher · external site · may require institutional access
Research Quality Score
Scored April 22, 2026 using rubric v9_2026-04-08.
Assessment
The study is a well-conducted empirical investigation into the effects of dietary supplementation on oxidative stress in older adults. It uses robust methods, including stable-isotope infusions, to measure outcomes. While it lacks blinding and randomization, it provides valuable insights into the potential benefits of cysteine and glycine supplementation for seniors. The study is published in a reputable journal and includes a clear conflict of interest disclosure.
Category Breakdown
| Category | Score | Rating |
|---|---|---|
| Study design | 6.7/10 | |
| Bias control | 6.7/10 | |
| Statistical methods | 10.0/10 | |
| Reporting completeness | 5.0/10 | |
| Conflicts & funding | 10.0/10 | |
| Replication | 0.0/10 | |
| Relevance to chosen population | 10.0/10 | |
| Journal Reliability | 10.0/10 |
Additional Notes
The study's findings are promising for reducing oxidative stress in seniors, but further replication is needed to confirm results.
Treatments Evaluated in This Research
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Supplements
Supplements help fill nutritional gaps and support healthy aging. For seniors, vitamins, minerals, and omega-3s can enhance bone strength, heart health, energy, and immune function when used safely under professional guidance.
N-Acetyl Cysteine (NAC)
NAC replenishes glutathione levels and supports lung, liver, and immune health through powerful antioxidant effects.
Selenium
Selenium supports thyroid hormone production, antioxidant defense, and immune function.
Pomegranate Extract
Pomegranate extract delivers polyphenols that support circulation, collagen health, and antioxidant defense for aging cells.
Magnesium Glycinate
Magnesium glycinate combines magnesium with glycine for superior absorption and gentle calming support.
Glutathione (Reduced Form)
Reduced glutathione is the active form of the body's master antioxidant. It neutralizes free radicals, supports detoxification in the liver, and helps regenerate other antioxidants like vitamins C and E.
Glycine
Glycine is a conditionally essential amino acid that serves as a building block for proteins and plays crucial roles in nervous system function, collagen synthesis, and sleep quality support.
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