Arab journal of urology2026n = 200 initially, 174 completed follow-up
RCTHuman
This study tested whether CoQ10, L-carnitine (an amino-acid-like nutrient the body uses to turn fat into energy), or both together improve semen quality in men with low sperm count, poor…
Antioxidants (Basel, Switzerland)2025
Narrative ReviewHuman
This review looked at how oxidative stress (cell damage from unstable molecules called reactive oxygen species, a normal byproduct of metabolism that turns harmful when it outpaces the body's defenses)…
Nutrition and health2025n = 15
RCTHuman
This study set out to test whether 8 weeks of creatine supplementation, alone or combined with ubiquinol (a form of CoQ10), could improve sperm quality in men with normal and…
Frontiers in pharmacology2024n = 877 (462 CoQ10-treated, 415 untreated/placebo-treated)
Meta AnalysisHuman
This systematic review and meta-analysis set out to assess whether coenzyme Q10 (CoQ10) supplementation improves semen quality and male hormone levels. It pooled data from eight randomized controlled trials involving…
Advances in nutrition (Bethesda, Md.)2018n = 28 articles for qualitative analysis, 15 for quantitative meta-analysis
Meta AnalysisHuman
Infertility affects about 15 percent of the world's population, which is what makes this question worth asking. This systematic review and meta-analysis pooled randomized trials testing whether nutrients, dietary supplements…
Journal of assisted reproduction and genetics2013n = 296 (149 CoQ10, 147 placebo)
Meta AnalysisHuman
This meta-analysis set out to see if coenzyme Q10 (CoQ10) supplements improve male fertility, focusing on live birth and pregnancy rates, sperm concentration, and sperm motility. It pooled data from…