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Gsh4.8
Glutathione Research
Mostly mechanism / observational
88 peer-reviewed studies
What the evidence says
Mostly mechanism / observational
Most Glutathione studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 1983–2026 with a typical study size of 1,019 participants.
Based on 88 studies · 3 meta-analyses · 77 RCTs · 1,213 total participants
Confidence
High confidence
By outcome
Therapeutic & clinical
Mostly mechanism / observational9 studies
Skin tone & pigmentationPopular oral skin-lightening use; systematic-review evidence is mixed and modest · 8-12 weeks
Mostly mechanism / observational4 studies
Respiratory & lung
Mostly mechanism / observational4 studies
Glucose & metabolic
Mostly mechanism / observational3 studies
Skin healthModest, often temporary skin-lightening / more even tone · 4-12 weeks
Mostly mechanism / observational3 studies
Kidney & renal health
Mostly mechanism / observational3 studies
Heart & blood pressure
Too few graded studies2 studies
Anemia & hematology
Too few graded studies2 studies
6 more outcomes with fewer studies not shown.
Steady research
19 studies in the last 5 years · Latest meta-analysis: 2026
198320042026
1Meta-Analysis2020
Zhao J, Huang W, Zhang S, Xu J, Xue W, He B · Am J Rhinol Allergy (2020)
Such supplementation can be beneficial, and it is most effective when combined with a diet rich in sulfur-containing foods and other nutrients that support GSH synthesis.
Bradauskienė V et al. · Nutrients (2026)
Whether through diet or supplementation, ensuring adequate GSH levels can have profound benefits on longevity, immunity, and overall well-being.
There are many foods known to contain GSH, and there are also many GSH supplements available on the market, but precursor-based supplements and compounds that activate GSH synthesis pathways show stronger and more consistent increases in human GSH.
A diet rich in protein (for amino acids) and phytochemical-dense plants can support this, while targeted precursors (e.g., glycine, γ-glutamylcysteine) and Nrf2-activating foods or agents provide the most robust increases shown so far.
3Glutathione-related enzyme activities in depressionMeta-Analysisn=1,019 · large study2026
Neuropsychopharmacology Reports published by John Wiley & Sons Australia, Ltd on behalf of The Japanese Society of Neuropsychopharmacology.
Etani T et al. · Neuropsychopharmacology reports (2026)
Our meta-analysis indicated significantly decreased activity of GPx in patients with depression compared with HC, while the levels of GSH and GR were not significantly different between the groups.
Because no studies, or an insufficient number of studies, have been conducted on GSSG, GST, GCL, and GS, meta-analyses were not performed for these metabolites and enzyme activities.
Our findings suggest that abnormal cycling of the GSH system, particularly decreased GPx activity, is involved in the pathophysiology of depression and may serve as a potential biomarker for this illness.