coenzyme q10 supplementation and oxidative stress parameters: an updated systematic review and meta-analysis of randomized controlled clinical trials

Background: oxidative stress (os) contributes to the development of some disorders, including malignancies, metabolic diseases,alzheimer’s disease, and parkinson’s disease.objectives: the effects of coenzyme q10 (coq10) supplementation on os parameters have been assessed through an updated systematicreview and meta-analysis.methods: scopus, pubmed, cochrane library, embase, and web of sciences were used for article searching. standardized meandifference (smd) and its standard error were calculated using a random-effects dersimonian and laird model. all analyses weredone using the stata software version 16.0 (statacorp, college station, tx).results: based on twenty-five studies which remained to be incorporated in the meta-analysis, a statistically significant decrease inmalondialdehyde (mda) (smd -2.74; 95% ci -3.89, -1.58; i^2 = 96.9%) as well as nitric oxide (no) (smd -5.16; 95% ci -7.98, 2.34; i^2 = 92.5%)was associated with coq10 supplementation, and a significant increase in total antioxidant capacity (tac) (smd 3.40; 95% ci 1.98,4.83; i^2 = 97.4%) and superoxide dismutase (sod) activity (smd 1.22; 95% ci 0.32, 2.1^2; i^2 = 94.32%).conclusions: the results showed no significant effect of coq10 supplementation on glutathione peroxidase (gpx), catalase (cat)activities, and glutathione (gsh) levels. coenzyme q10 supplementation significantly reduced mda and no concentrations andincreased tac and sod activity.