Coenzyme Q10 (CoQ10) has quietly become one of the most researched supplements in fertility medicine. It’s not new — scientists have studied it for over 60 years, originally for heart health — but the last several years have brought a wave of clinical research specifically on how it affects egg quality, sperm quality, and IVF outcomes. And importantly, this isn’t a “women’s supplement.” The research on CoQ10 for male fertility is just as strong (pay attention, you men out there!).
Here’s what the current evidence actually says, and how to think about using it.
Drew has 25 years of clinical experience treating fertility and pregnancy-related conditions, and has spent 18 years training acupuncturists and other healthcare practitioners across Ontario in Traditional Chinese Medicine techniques — including Naturopathic Doctors & Medical Doctors.
What CoQ10 Does, and Why It Matters for Fertility
CoQ10 plays a central role in how your cells produce energy (ATP) inside the mitochondria — and both eggs and sperm are unusually mitochondria-dense cells, since maturing an egg or powering a sperm cell’s swim toward fertilization takes an enormous amount of cellular energy. CoQ10 also acts as an antioxidant, helping protect these cells from oxidative stress, which is one of the more consistently identified contributors to declining egg and sperm quality over time.
The challenge is that natural CoQ10 levels — and your body’s ability to absorb and convert it — decline with age, typically starting in your mid-to-late 20s. That decline is a big part of why researchers have been so interested in whether supplementing it can help offset age-related fertility decline.
CoQ10 and Egg Quality: The Case for Taking It Seriously
The research base here has grown substantially. A 2025 review in Frontiers in Cell and Developmental Biology synthesized the current evidence on CoQ10 and female fertility, concluding that supplementation improves oocyte quality, ovarian function, and mitochondrial efficiency, and has been linked to increased pregnancy rates in both natural conception and IVF/ART cycles.
A 2024 meta-analysis published in Annals of Medicine, pooling data from six randomized controlled trials and over 1,500 women, found that CoQ10 pretreatment improved pregnancy rates, egg and embryo quality, and reduced the amount of hormone medication needed during IVF cycles — with the strongest effects seen in women with diminished ovarian reserve (DOR).
Much of this research builds on a landmark 2018 randomized controlled trial published in Reproductive Biology and Endocrinology, which first demonstrated that 60 days of CoQ10 pretreatment improved ovarian response and embryo quality in women with decreased ovarian reserve.e.
The consistent theme across this research: CoQ10 appears to meaningfully support the biological factors that lead to better IVF outcomes, particularly for women over 35 or with diminished ovarian reserve.
CoQ10 Matters Just as Much for Men
This is the piece that gets left out of most conversations about fertility supplements — but the research on male fertility is arguably just as strong.
A 2025 systematic review and meta-analysis published in the World Journal of Men’s Health, pooling nine randomized trials and 781 men, found that CoQ10 supplementation significantly improved sperm concentration, seminal volume, and total sperm motility, along with increased clinical pregnancy odds — with the strongest improvements seen when CoQ10 was used for longer than three months.
A separate systematic review and meta-analysis of randomized controlled trials found that CoQ10 supplementation increased total sperm count, total and progressive sperm motility, and the proportion of normally formed sperm, alongside higher testosterone levels.
If male factor infertility is part of the picture — or even a suspected contributor — this research makes a strong case that CoQ10 belongs in the conversation for men just as much as for women. Fertility is rarely a one-sided issue, and treating it that way overlooks half of the equation. [If you’re looking for a broader look at supporting male fertility, I’ve put together a full guide here:
Ubiquinone vs. Ubiquinol: Which One Should You Take?
This is where a lot of fertility supplement marketing oversimplifies things, so it’s worth getting right.
CoQ10 exists in two forms: ubiquinone (the oxidized form) and ubiquinol (the reduced, more bioavailable form your body converts ubiquinone into). As we age, that conversion becomes less efficient, which is the basis for the argument that ubiquinol may be the better choice, particularly for women over 40.
That said, it’s worth knowing that most of the clinical trials showing benefit for egg and sperm quality actually used standard ubiquinone, not ubiquinol. Both forms appear to be safe and effective based on the current evidence; ubiquinol may offer a modest absorption advantage, especially with age, but it isn’t a case of one form working and the other not.
What Doses Did the Research Actually Use?
Research protocols have varied, but some patterns are consistent:
- For egg quality/IVF outcomes: studies have generally used doses in the range of 200–600 mg per day, most often started 8–12 weeks (roughly the length of an egg maturation cycle) before an IVF cycle or active conception attempts.
- For male fertility: studies showing the clearest benefit typically used CoQ10 for longer than three months, with doses generally in a similar 200–600 mg per day range.
These figures reflect what’s been studied in trials, not a personalized recommendation — the right dose and form depends on your individual situation, so it’s worth discussing with a practitioner familiar with your fertility history before starting.
The Bottom Line
The research on CoQ10 and fertility has matured significantly in recent years, and the picture is fairly consistent: it appears to meaningfully support egg quality and IVF outcomes, particularly for women with diminished ovarian reserve, and it shows equally strong evidence for improving sperm quality in men. It’s one of the few fertility supplements with this much human clinical trial support behind it — for both partners.
If you’re building out a broader supplement strategy for fertility, egg and sperm quality nutrients don’t work in isolation — you can see how CoQ10 fits alongside other evidence-based options here.
If you’d like to talk through whether CoQ10 — and which form and dose — makes sense for your specific situation, consider booking in to see me in person at my convenient clinic on the Danforth. Reach out today and let’s figure out the right approach together.
Sources
- Jiang Y, Han Y, Qiao P, Ren F. Exploring the protective effects of coenzyme Q10 on female fertility. Frontiers in Cell and Developmental Biology. 2025;13:1633166. https://pmc.ncbi.nlm.nih.gov/articles/PMC12425901/
- Lin G, Li X, Lim Jin Yie S, Xu L. Clinical evidence of coenzyme Q10 pretreatment for women with diminished ovarian reserve undergoing IVF/ICSI: a systematic review and meta-analysis. Annals of Medicine. 2024;56(1):2389469. https://doi.org/10.1080/07853890.2024.2389469
- Xu Y, Nisenblat V, Lu C, et al. Pretreatment with coenzyme Q10 improves ovarian response and embryo quality in low-prognosis young women with decreased ovarian reserve: a randomized controlled trial. Reproductive Biology and Endocrinology. 2018;16(1):29. https://link.springer.com/article/10.1186/s12958-018-0343-0
- Gharakhani Bahar T, Masoumi SZ, Pilehvari S, Kazemi F, Moradkhani S, Mahmoudi S. Efficacy and Safety of Coenzyme Q10 in Idiopathic Male Infertility: A Systematic Review and Meta-Analysis of Randomized Trials. World Journal of Men’s Health. 2025. https://doi.org/10.5534/wjmh.250159
- Does coenzyme Q10 improve semen quality and circulating testosterone level? A systematic review and meta-analysis of randomized controlled trials. https://pubmed.ncbi.nlm.nih.gov/39830337/
About Drew
Drew Nesbitt BA, R.TCMP, R.Ac., RHN is a registered TCM practitioner and acupuncturist with over 25 years of clinical experience, helping patients in Toronto with fertility, stress, and chronic health concerns.