CoQ10 (Coenzyme Q10)

What is CoQ10?

Coenzyme Q10 (CoQ10) is a fat-soluble antioxidant produced naturally in cells, essential for mitochondrial energy production (ATP synthesis). In fertility, CoQ10 is most studied for improving egg quality in women with diminished ovarian reserve and for improving sperm motility in men with asthenospermia. Typical doses used in fertility research: 400–600 mg/day (women); 200–300 mg/day (men). Evidence is promising but not definitive — no large RCTs confirm IVF success rate improvement.

Key facts about CoQ10

• Naturally produced in cells — levels decline with age, paralleling egg quality decline
• Essential for mitochondrial electron transport chain — energy production in oocytes and sperm
• Female use: 400–600 mg/day (ubiquinol) for at least 3 months before IVF egg retrieval
• Evidence: small RCTs show improved follicle number, retrieved egg count, and fertilisation rates in DOR patients — no large RCT on live birth rates
• Male use: 200–300 mg/day — studies show improvement in sperm count, motility, and morphology in oligoasthenospermia
• Ubiquinol (reduced form) preferred over ubiquinone (oxidised form) — 3–4x better bioavailability, especially over age 35
• Generally well tolerated; fat-soluble — take with a meal containing fat for best absorption
• Does not replace standard treatment — additive benefit alongside IVF stimulation or sperm preparation

Why CoQ10 matters in fertility

CoQ10 is one of the most scientifically rational fertility supplements. The biological rationale is strong — oocyte energy dependence on mitochondria, age-related CoQ10 decline, and the correlation between mitochondrial function and embryo competence. Clinical evidence is encouraging but not yet definitive enough to be guideline-level. Most reproductive endocrinologists consider it a reasonable adjunct for women with diminished ovarian reserve and for men with suboptimal sperm parameters.

What are related terms to CoQ10?