CoQ10 for Fertility: Does It Help Egg or Sperm Quality?
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CoQ10 is a popular add-on supplement for people over 35 or with low ovarian reserve. The research is real but narrow: most of it comes from IVF clinics and from men with abnormal semen tests. Here is what the trials show, how strong each finding is, and what to ask before you buy it.
What is CoQ10?
Coenzyme Q10 is a substance naturally present in the body, found in the highest amounts in the heart, liver, kidneys and pancreas, and sold in the US as a dietary supplement.6 It is an antioxidant, and researchers have tested it in IVF to see whether it improves the response to stimulation and embryo quality.12
Like all supplements, CoQ10 is not FDA-approved. By law, the FDA does not approve dietary supplements or their labeling before they are sold.7
CoQ10 for fertility: the evidence at a glance
We grade each claim using the certainty ratings from Cochrane reviews and the design of the best available trials.
| Claim | What the studies show | Evidence grade |
|---|---|---|
| More clinical pregnancies in IVF | 28.8% vs 14.1% across 5 RCTs; no significant difference in live births1 | Low |
| More eggs and embryos with poor ovarian reserve | One RCT in women under 35; pregnancy and live birth not significantly different2 | Low |
| Better chances when conceiving naturally | No trials | Insufficient |
| Better sperm count and motility | Improved in a meta-analysis; no rise in pregnancy rates4 | Low |
| More live births when men take antioxidants | Possible benefit disappears in low-bias trials5 | Very low |
Does CoQ10 help women get pregnant?
It may help women going through IVF, but the evidence stops short of live births. A 2020 meta-analysis pooled five randomized trials with 449 infertile women undergoing assisted reproduction. Clinical pregnancy was more common with oral CoQ10 than with placebo or no treatment (28.8% vs 14.1%; OR 2.44).1 The effect held in subgroups with poor ovarian response and with PCOS. But live birth rates did not differ significantly (OR 1.67, 95% CI 0.66 to 4.25), and neither did miscarriage.1
The most cited single trial enrolled 186 women under 35 with poor ovarian reserve. Those randomized to 200 mg of CoQ10 three times a day for 60 days before IVF needed less stimulation medication, had more eggs retrieved, a higher fertilization rate and more high-quality embryos.2 Clinical pregnancy and live birth rates trended higher but were not statistically significant, and the trial was open label.2
Cochrane’s broader review of antioxidants for subfertile women, which includes CoQ10 trials, found low- to very low-quality evidence that antioxidants may help, and concluded that the evidence supporting them is limited.3
What is missing: no published trial has tested CoQ10 in people trying to conceive naturally. If you have low AMH and are heading toward IVF, it is a reasonable question for your clinic.
Does CoQ10 help sperm?
It appears to improve some semen numbers, not proven pregnancy rates. A 2013 meta-analysis found that infertile men taking CoQ10 had higher sperm concentration and motility, but none of the trials reported live births and the pooled data showed no increase in pregnancy rates.4
The 2022 Cochrane review of antioxidants for male subfertility, covering 90 studies and 10,303 men and 20 different antioxidants, found that antioxidants may increase live birth rates, but the certainty was very low, and the effect disappeared when trials at high risk of bias were removed.5 Sperm take about 74 days to develop, so trials in men usually run for around three months.8 For a full plan, see our 90-day sperm health plan.
How much CoQ10 do studies use?
There is no guideline dose for fertility. The 2018 trial in women with poor ovarian reserve used 600 mg a day, split into three 200 mg doses, for 60 days.2 Other trials used different doses and forms, which is one reason results are hard to pool. If your clinic recommends CoQ10, ask which dose and form, and for how long.
Is CoQ10 safe?
No serious side effects have been reported, according to the NIH.6 Some people get mild sleep problems or digestive upset. CoQ10 may interact with warfarin, and possibly with insulin and some cancer treatments.6 The NIH page does not address pregnancy, so safety during pregnancy is not established. Ask your doctor whether to stop at a positive test.
CoQ10 is not a substitute for the basics. The CDC recommends 400 mcg of folic acid daily for everyone who could become pregnant, starting at least one month before conception.9
Should you take CoQ10?
If you are trying naturally with no known issues, there is no trial evidence that CoQ10 will help you conceive sooner. If you are preparing for IVF with poor ovarian reserve, the evidence is promising but low certainty, and worth discussing with your clinic. If your partner has abnormal semen results, it may improve the numbers, though not proven pregnancy rates.
If you consider a supplement, talk through the dose with your doctor or fertility clinic. Antioxidants such as NAC have similar, limited evidence. For the full preconception picture, start at the Prepare hub.
Frequently asked questions
This page is educational and is not medical advice. Talk to a clinician about your own situation, and seek urgent care for heavy bleeding, severe pain or fainting.
Keep reading
Low AMH: Can You Still Get Pregnant?
Low AMH means fewer eggs, not infertility. What the JAMA Time to Conceive study found, how low AMH changes IVF, and when a low result should speed up your timeline.
NAC for Fertility: What N-Acetylcysteine Can and Can’t Do
NAC (N-acetylcysteine) for fertility: PCOS ovulation and pregnancy trials, sperm studies, Cochrane evidence grades, doses used, safety and FDA status.
The 90-Day Sperm Health Plan
A 12-week sperm health plan built on the 74-day sperm cycle: when to test, what to stop, heat, weight, alcohol, honest supplement evidence and when to retest.
Step 1: Prepare for pregnancy
How to prepare for pregnancy: when to start a prenatal and folic acid, what a preconception checkup covers, and what the evidence says about supplements.
Sources
- 1Does 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. Florou P et al., 2020. 5 RCTs, 449 women
- 2Pretreatment 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. Xu Y et al., 2018. 186 women under 35 with poor ovarian reserve; 200 mg three times daily for 60 days
- 3Antioxidants for female subfertility. Cochrane Database of Systematic Reviews. Showell MG et al., 2020. 63 trials, 7,760 women, including CoQ10
- 4Coenzyme Q10 and male infertility: a meta-analysis. Journal of Assisted Reproduction and Genetics. Lafuente R et al., 2013
- 5Antioxidants for male subfertility. Cochrane Database of Systematic Reviews. de Ligny W, Smits RM et al., 2022. 90 studies, 10,303 men
- 6Coenzyme Q10. NIH National Center for Complementary and Integrative Health. Safety, side effects, warfarin interaction
- 7Questions and answers on dietary supplements. U.S. Food and Drug Administration. FDA does not approve dietary supplements before they are marketed
- 8Clinical assessment of the male fertility. Obstetrics & Gynecology Science. Khatun A et al., 2018. Spermatogenesis takes about 74 days
- 9About folic acid. Centers for Disease Control and Prevention. 400 mcg daily, at least 1 month before conception