Coenzyme Q10 and Infertility
Medically Reviewed by Dr. Silvana Chedid on July 31, 2026
Coenzyme Q10, or CoQ10, is a naturally occurring antioxidant that recent research links to healthier egg and sperm quality by reducing oxidative stress in reproductive cells. Because oxidative stress is one of the mechanisms behind age-related and environmental damage to eggs and sperm, CoQ10 has become one of the most studied supplements in fertility medicine over the past several years.
At Chedid Grieco, patients frequently ask what they can do on their own, alongside treatment, to support their chances of success. Understanding what CoQ10 does at the cellular level, and what the current evidence actually shows, helps set realistic expectations before adding any supplement to your routine.
What Coenzyme Q10 Does in the Body
CoQ10 is a natural electron donor and antioxidant that helps neutralize reactive oxygen species, the unstable molecules responsible for oxidative stress. Oxidative stress damages cell membranes, proteins, and DNA, and it plays a role in both the natural decline of egg quality with age and the cellular damage caused by environmental contaminants.
A study published in the journal Genetics demonstrated this mechanism directly. Researchers exposed C. elegans to bisphenol A (BPA), a chemical contaminant found in some plastics, can linings, thermal receipts, and dental sealants, and found that BPA increased oxidative stress, DNA breaks, chromosome abnormalities, and defects in early embryo formation. When the organisms were supplemented with CoQ10, egg death rates, DNA breaks, and oxidative stress markers all decreased, and mitochondrial function was partially restored.
How BPA and Similar Chemicals Affect Fertility
BPA shares a chemical structure similar enough to estrogen that it can bind to estrogen receptors, producing pro-estrogenic or anti-estrogenic effects depending on the tissue involved. This endocrine-disrupting activity can affect the reproductive system as well as other hormone-sensitive processes in the body.
In the same study, BPA exposure increased DNA breaks through reactive oxygen species generated by the contaminant, and researchers observed more significant mitochondrial dysfunction as the cell’s energy-producing structures became deregulated. Because oxidative stress from BPA and similar chemicals accumulates over a lifetime, it is difficult to separate how much of a given case of infertility comes from environmental exposure versus age alone; both factors typically contribute.
What the Research Showed About Embryo Development
Researchers also tracked embryo formation directly using live-cell imaging, focusing on the first cell division, the moment an embryo goes from one cell to two, as a marker for normal development. In organisms exposed only to BPA, defects such as bridges of genetic material between dividing cells and arrested cell division occurred more frequently. These markers improved in the group that received CoQ10 supplementation alongside BPA exposure, supporting the idea that CoQ10’s antioxidant activity can help offset this specific type of cellular damage.
The full study, Antioxidant CoQ10 Restores Fertility by Rescuing Bisphenol A-induced Oxidative DNA Damage in the Caenorhabditis elegans Germline, was published in the journal Genetics. More recent work has extended these findings; a 2025 review in PMC summarizes evidence that CoQ10 supplementation is associated with improved ovarian function, egg number, and embryo quality, particularly in women with diminished ovarian reserve.
CoQ10 and Fertility Treatment Outcomes
Beyond the laboratory research, clinical studies in women undergoing fertility treatment have examined whether CoQ10 supplementation improves outcomes for patients with poor ovarian response or polycystic ovary syndrome (PCOS). Findings generally point toward modestly improved egg yield and clinical pregnancy rates in these subgroups compared with placebo, though results vary by dose, duration, and the population studied. CoQ10 has also been studied in men, where research associates it with improvements in sperm motility and morphology.
These findings are encouraging, but CoQ10 is not a substitute for a full fertility evaluation. Patients considering supplementation should discuss dosing and timing with their fertility team, since the studies showing benefit typically used supplementation for several months before an egg retrieval or treatment cycle, not as a short-term fix.
Reducing Oxidative Stress Alongside Treatment
CoQ10 is one piece of a broader picture that includes minimizing exposure to endocrine-disrupting chemicals where practical, maintaining a balanced diet, and addressing any underlying reproductive conditions through a personalized treatment plan. For patients preparing for IVF or in vitro maturation, a fertility specialist can help determine whether antioxidant supplementation, alongside other lifestyle adjustments, makes sense given your ovarian reserve testing and treatment timeline.
Frequently Asked Questions About CoQ10 and Fertility
What does CoQ10 do for fertility?
CoQ10 is a natural antioxidant that helps neutralize reactive oxygen species, reducing oxidative stress in eggs, sperm, and developing embryos. Research links this reduction in oxidative stress to improved egg quality, better mitochondrial function, and fewer DNA breaks in reproductive cells.
Can CoQ10 reverse the effects of BPA exposure?
A study published in the journal Genetics found that CoQ10 supplementation reduced oxidative stress, DNA breaks, and embryo defects caused by bisphenol A exposure in a laboratory model. These findings suggest a protective effect, though more clinical research in humans is still needed to establish exact dosing guidance.
Is CoQ10 helpful for both men and women trying to conceive?
Research suggests CoQ10 may benefit both partners. In women, it is associated with improved egg quality and ovarian response, while in men, studies link it to improvements in sperm motility and morphology. Individual results vary, so a fertility evaluation helps determine whether supplementation is appropriate for your situation.
How long before treatment should I start taking CoQ10?
Most clinical studies showing benefit used CoQ10 supplementation for around three months before an egg retrieval or treatment cycle, since egg and sperm development take place over a period of months. Starting well ahead of treatment gives the supplement time to have a measurable effect.
Should I take CoQ10 instead of getting a fertility evaluation?
No. CoQ10 may support egg and sperm quality, but it does not address structural, hormonal, or genetic causes of infertility. A full evaluation identifies the specific factors affecting your fertility so that supplementation, if appropriate, can be paired with the right treatment plan.
Antioxidant support like CoQ10 can play a meaningful role in a broader fertility plan, but it works best as one part of a personalized approach rather than a stand-alone strategy. Our team reviews your ovarian reserve, cycle history, and any relevant exposures to help you understand where supplementation may help and where treatment is the more direct path forward.
Consultations are held in Miami, Florida, with treatment carried out at our laboratory in Brazil; details on how that process works are available on our fertility tourism page. To discuss whether CoQ10 or another approach fits your fertility goals, reach out through our contact form.
About the Author
Founder, Chedid Grieco Reproductive Medicine Laboratory
Dr. Silvana Chedid trained in Human Reproduction and Gynecological Endoscopy at the Free University of Brussels before helping bring intracytoplasmic sperm injection to Brazil in 1992. She founded the Chedid Grieco Reproductive Medicine Laboratory in 2002 and is a member of the American and European Human Reproduction Societies.
