CoQ10 (coenzyme Q10)
The verdict
Smaller trials suggest better egg/embryo numbers (women) and sperm parameters (men); no live-birth-level evidence yet.
An antioxidant involved in mitochondrial energy production; marketed for "egg quality" (women) and sperm quality (men). No dedicated Cochrane review yet.
What the evidence shows
Women, diminished ovarian reserve: several small RCTs/meta-analyses (largest ~1,529 participants across 6 RCTs) show more retrieved oocytes, higher fertilization rate, more high-quality embryos with CoQ10 pretreatment (typically 3 months before stimulation) — but these are egg/embryo-count surrogate outcomes, not confirmed live-birth benefit.
Men: separate systematic reviews report sperm-quality improvements; similar evidence tier.
Evidence tier
Non-Cochrane evidence🟡 Smaller systematic reviews/meta-analyses or RCTs exist, no Cochrane-grade synthesis. Emerging, not proven.
Sources
Take this further
Last reviewed .