CoQ10 and Vitamin E Before IVF With Diminished Ovarian Reserve: What New Research Shows
The quick summary: In a 2026 study of 949 women with diminished ovarian reserve having IVF, those who took CoQ10 beforehand had more embryos suitable for transfer, and those who took CoQ10 together with vitamin E had more top quality embryos. Pregnancy and live birth rates did not differ between groups, and because the study looked back at existing records, it cannot prove that the supplements caused these differences.
If you have been told you have diminished ovarian reserve, you may know a very particular kind of heartache. You put money, time and hope into a cycle of IVF, and the question becomes not only whether a transfer will work, but whether there will be an embryo to transfer at all. Some people go through several egg retrievals and reach only one or two transfers, while others may have several chances from a single cycle.
That is why research on small, potentially low risk changes before treatment deserves a genuine review. When each cycle carries this much cost and stress, one additional embryo can mean a great deal, even while the science on pregnancy rates is still unsettled.
What did the new study on CoQ10 and vitamin E find?
Wang and colleagues, writing in Frontiers in Endocrinology in 2026, reviewed the first IVF cycle of 949 women with diminished ovarian reserve at a fertility centre in Hefei, China. For two months before ovarian stimulation, some women had taken coenzyme Q10 (CoQ10), some vitamin E, some both, and some neither. This was a group facing real challenges: a typical cycle yielded just two eggs, and 220 of the 949 cycles produced no embryo suitable for transfer.
After the researchers accounted for factors such as age, ovarian reserve and medication dose, women who took CoQ10, with or without vitamin E, had more transferable embryos than women who took neither. Adding vitamin E did not clearly raise that number beyond CoQ10 alone, which suggests CoQ10 may have been doing most of the work for this outcome. The estimated average rose from about 0.9 transferable embryos per woman with neither supplement to about 1.0 with CoQ10 and 1.1 with both.
The picture was different for top quality embryos, meaning those with the best appearance under the microscope. Only the group taking both supplements stood out, with an estimated average of about 0.75 per woman compared with about 0.5 for women taking neither. Vitamin E on its own showed no advantage. In fact, women taking vitamin E without CoQ10 had somewhat fewer top quality embryos than women taking neither, although the authors caution that this should not be read as evidence that vitamin E harms embryos.
Why do more embryos matter if pregnancy rates did not change?
Here is the most important limit of this study: clinical pregnancy, live birth and early miscarriage rates did not differ significantly between the groups. An embryo’s appearance also cannot tell us everything about its chromosomes or its ability to implant, so more embryos on paper does not guarantee a pregnancy.
Even so, for someone with diminished ovarian reserve, these outcomes are far from trivial. Having an embryo to transfer can be the difference between a cycle that offers a chance at pregnancy and one that ends without that chance. A second embryo may also mean one fewer retrieval, with the cost, medication and emotional toll that each one brings. This study did not measure those benefits directly, so they remain a reasonable hope rather than a proven result. It may also have been too small to detect a modest difference in live births.
How strong is the evidence for CoQ10 and vitamin E?
The strongest supporting evidence is for CoQ10. In a 2018 randomized trial by Xu and colleagues, women under 35 with low ovarian reserve who took CoQ10 for 60 days before IVF had more eggs retrieved and more high quality embryos, and fewer of them ended up without an embryo to transfer. Pregnancy and live birth rates trended higher, but those differences were not statistically significant.
When Lin and colleagues pooled six randomized trials involving 1,529 women with diminished ovarian reserve in 2024, CoQ10 was associated with a higher clinical pregnancy rate and more good quality embryos, although the authors noted that the trials described their methods poorly. A broader 2020 review by Florou and colleagues also found higher clinical pregnancy rates but no clear difference in live births, and a 2020 Cochrane review found the live birth evidence for CoQ10 too limited to be certain. Taken together, the evidence for CoQ10 is modest but real, while a benefit for live birth has not been established. Research on vitamin E in this setting is far more limited, and the idea of combining it with CoQ10 rests largely on this one study.
As for the new study itself, it was large, but it was retrospective, meaning it looked back at records rather than randomly assigning treatment. Physicians suggested the supplements and patients chose whether to take them, so the groups may have differed in ways that were not measured, such as diet, lifestyle or male partner factors. Blood levels of these nutrients and markers of oxidative stress were not measured, and the study had no information on embryo chromosomes. It also came from a single centre, and its authors describe the findings as exploratory: a reason for randomized trials rather than a reason to recommend these supplements routinely.
Are CoQ10 and vitamin E safe to take before IVF?
Natural does not automatically mean risk free. CoQ10 is generally well tolerated, although it can cause digestive upset, dizziness or trouble sleeping. It has been reported to reduce the effect of warfarin, and it may lower blood pressure and blood sugar, which matters for anyone taking medication for those concerns.
Vitamin E calls for more caution, because higher amounts can increase bleeding risk and may interact with medications that affect clotting, including warfarin and aspirin. That is especially relevant around an egg retrieval and for anyone whose physician has prescribed aspirin or a blood thinner. The amount of vitamin E used in this study was well above what the body needs each day, and information on higher supplement amounts during pregnancy is limited.
We have left the study doses out of this article on purpose, because what is appropriate depends on your history, your medications and the timing of your treatment. A discussion with a fertility focused naturopathic doctor can help provide clarity on a personalized approach rooted in safety, with transparency about the evidence behind each recommendation.
Who can help you decide whether these supplements fit your IVF plan?
At our clinic, care for diminished ovarian reserve looks at the whole picture. Depending on your history, that can include a careful review of your blood work, nutrition, current medications and supplements, product quality and the timing of your upcoming cycle, with safety and interaction checks before anything is considered. Because embryos come from both egg and sperm, we also look at the male partner, including semen analysis and sperm DNA fragmentation when appropriate. Emotional support matters too. Any changes to your medications are decided with your physician, and we are glad to work alongside your fertility clinic.
If you are living with diminished ovarian reserve, you have likely been handed a long list of things to try, and it can be hard to know what is worth your energy. The research on CoQ10 is encouraging without being conclusive. A fertility focused naturopathic doctor can help you weigh what the evidence does and does not show for your own situation, alongside your medical team. Whenever you feel ready, we would be glad to help.
Disclaimer
This article is for educational purposes only and is not medical advice. It is not intended to diagnose, treat, or prevent any condition. Individual circumstances vary, and decisions about your care should be made with your own healthcare team. If you are trying to conceive or are currently in treatment, please speak with your physician or a licensed naturopathic doctor before making changes.
Related reading
References
1. Wang S, Wang T, Zhang W, Liu Y, Cao Y. Association of vitamin E and coenzyme Q10 pretreatment with embryological and pregnancy outcomes in women with diminished ovarian reserve: a retrospective study. Frontiers in Endocrinology. 2026;17:1936380. https://doi.org/10.3389/fendo.2026.1936380
2. Xu Y, Nisenblat V, Lu C, Li R, Qiao J, Zhen X, Wang S. 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://doi.org/10.1186/s12958-018-0343-0
3. Lin G, Li X, Jin Yie SL, 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
4. Florou P, Anagnostis P, Theocharis P, Chourdakis M, Goulis DG. Does coenzyme Q10 supplementation improve fertility outcomes in women undergoing assisted reproductive technology procedures? A systematic review and meta-analysis of randomized-controlled trials. Journal of Assisted Reproduction and Genetics. 2020;37(10):2377–2387. https://doi.org/10.1007/s10815-020-01906-3
5. Showell MG, Mackenzie-Proctor R, Jordan V, Hart RJ. Antioxidants for female subfertility. Cochrane Database of Systematic Reviews. 2020;8(8):CD007807. https://doi.org/10.1002/14651858.CD007807.pub4
6. Raizner AE, Quiñones MA. Coenzyme Q10 for patients with cardiovascular disease: JACC focus seminar. Journal of the American College of Cardiology. 2021;77(5):609–619. https://doi.org/10.1016/j.jacc.2020.12.009
7. Podszun M, Frank J. Vitamin E–drug interactions: molecular basis and clinical relevance. Nutrition Research Reviews. 2014;27(2):215–231. https://doi.org/10.1017/S0954422414000146
