CoQ10 for Pregnancy: What Studies Show About Egg Quality and Conception

CoQ10 has attracted attention in reproductive medicine because developing eggs require large amounts of cellular energy.

Inside cells, CoQ10 participates in the mitochondrial electron transport chain, which helps generate ATP, the molecule cells use as energy. It also participates in antioxidant defence.

These functions provide a biological reason to study CoQ10 in fertility, particularly as mitochondrial function changes with reproductive ageing.

But there is an important distinction:

A biological mechanism does not automatically mean that taking CoQ10 increases someone's chance of becoming pregnant.

Human studies have primarily examined CoQ10 in women undergoing assisted reproductive technology (ART), including IVF and ICSI, rather than in the general population trying to conceive naturally.

The most interesting signal so far concerns clinical pregnancy rates, particularly among women with diminished ovarian reserve. 

Why Is CoQ10 Studied for Female Fertility?

Mitochondria Help Power Oocyte Development

An oocyte, or egg cell, requires considerable energy as it grows, matures, completes meiosis, undergoes fertilisation and supports the earliest stages of embryo development.

Mitochondria provide much of this energy.

Research increasingly connects mitochondrial function with oocyte competence and reproductive ageing. Changes in mitochondrial energy production, oxidative phosphorylation and cellular redox balance have therefore become important areas of fertility research.

CoQ10 is relevant because it serves as a component of mitochondrial energy production while also functioning as an antioxidant.

Experimental research has also found age-related changes in pathways involved in CoQ10 production in oocytes. However, much of the mechanistic evidence comes from laboratory and animal research, so it should not be treated as proof that supplementation reverses ovarian ageing in humans.

CoQ10 and Egg Quality: What Has Actually Been Observed?

“Improves egg quality” is frequently used when discussing CoQ10, but scientifically, egg quality is difficult to measure directly in humans.

Researchers instead evaluate related outcomes such as:

• number of mature oocytes
• fertilisation rates
• embryo development
• number of high-quality embryos
• ovarian response to stimulation
• clinical pregnancy
• live birth

A review specifically examining CoQ10 and human oocyte quality concluded that the available evidence provides biological and clinical interest but does not clearly prove that CoQ10 improves human oocyte quality.

That distinction is important when interpreting fertility supplement claims.

What IVF Studies Have Observed

One randomised controlled trial examined 186 women under 35 with reduced ovarian reserve who were preparing for IVF/ICSI.

Participants assigned to CoQ10 received pretreatment for 60 days before ovarian stimulation.

Among the reported findings, the CoQ10 group had:

• more retrieved oocytes
• a higher fertilisation rate
• more high-quality embryos
• fewer cancelled embryo transfers due to poor embryo development

However, although clinical pregnancy and live-birth rates were numerically higher, the differences did not reach statistical significance.

This means the study observed differences in several intermediate reproductive outcomes, but it could not establish that CoQ10 increased the chance of pregnancy or live birth.

Does CoQ10 Increase Clinical Pregnancy Rates?

This is one of the most important questions because pregnancy outcomes matter more clinically than changes in laboratory markers alone.

A 2020 systematic review and meta-analysis evaluated five randomised controlled trials involving 449 women with infertility undergoing assisted reproductive treatment.

Clinical pregnancy occurred in:

28.8% of women receiving CoQ10 versus 14.1% in control groups.

The pooled odds ratio was 2.44 (95% CI 1.30–4.59).

The analysis suggests a possible association between CoQ10 supplementation and clinical pregnancy in women undergoing ART, but it does not establish that CoQ10 increases the likelihood of ultimately having a baby.

What More Recent Evidence Shows

A 2024 systematic review and meta-analysis focused specifically on women with diminished ovarian reserve undergoing IVF or ICSI.

It included six randomised controlled trials and 1,529 participants.

CoQ10 pretreatment was associated with a higher clinical pregnancy rate: OR 1.84, 95% CI 1.33–2.53.

Researchers also reported differences in outcomes including:

• number of retrieved oocytes
• number of optimal embryos
• cycle cancellation
• gonadotropin requirements

However, the authors specifically cautioned that the available trials had relatively limited sample sizes and weaknesses in methodological reporting.

Therefore, the result should be interpreted as encouraging evidence requiring better-quality confirmation, rather than proof of a fertility benefit.

More recent research reinforces this uncertainty. A 2026 randomised study involving women with poor ovarian response observed differences in several ovarian-response measures after CoQ10 supplementation but found no significant difference in clinical pregnancy rates.

Taken together, the evidence is not entirely consistent.

Who Has CoQ10 Been Studied in?

Most positive human fertility research does not involve healthy women simply trying to conceive.

Studies have primarily involved specific groups.

Women With Diminished Ovarian Reserve

This is currently one of the most studied populations.

Diminished ovarian reserve means fewer remaining follicles or a reduced expected response to ovarian stimulation. It does not necessarily mean that natural conception is impossible.

Several trials and meta-analyses have investigated whether CoQ10 pretreatment changes ovarian stimulation or IVF outcomes in these women.

The evidence has produced some positive signals, particularly for ovarian-response measures and clinical pregnancy, but definitive evidence for live birth remains limited.

Women With Poor Ovarian Response

CoQ10 has also been studied in women who respond poorly to fertility medications during IVF or ICSI.

Some studies have observed higher numbers of retrieved oocytes or differences in other stimulation outcomes.

However, changes in ovarian response do not automatically translate into higher pregnancy or live-birth rates.

Women Undergoing IVF or ICSI

Most clinical evidence linking CoQ10 with conception comes from assisted reproductive treatment.

This means the findings should not automatically be extrapolated to natural conception.

There are currently far fewer high-quality trials determining whether CoQ10 helps otherwise healthy couples conceive naturally.

CoQ10 and Fertility After 35

Female fertility generally declines with age, with both the number and reproductive competence of available oocytes changing over time.

Mitochondrial dysfunction and oxidative stress are among several biological processes being investigated as contributors to reproductive ageing.

Because CoQ10 is involved in mitochondrial energy metabolism, it has consequently been studied in the context of age-related reproductive change.

However, this should not be interpreted to mean:

“Women over 35 should take CoQ10 to improve egg quality.”

Current research does not support a universal recommendation like this.

Age-related fertility is influenced by numerous factors, including ovarian reserve, chromosomal competence of oocytes, reproductive anatomy, sperm factors and underlying health conditions.

CoQ10 is only one investigational part of a much larger picture.

How Long Before Conception Has CoQ10 Been Studied?

There is no universally established fertility dose or duration for CoQ10.

Trials use different protocols.

For example, the 2018 randomised trial in women with decreased ovarian reserve used CoQ10 for 60 days before IVF/ICSI treatment.

Other studies and reviews have examined pretreatment periods lasting several weeks to several months.

This is why statements such as:

“Take CoQ10 for exactly three months before trying to conceive”

are stronger than the evidence permits.

Follicular development occurs across an extended developmental process, which provides a rationale for studying supplements before ovarian stimulation rather than immediately before egg retrieval. But the optimal duration of CoQ10 supplementation for fertility has not been established.

What CoQ10 Dose Has Been Studied for Fertility?

There is no standard clinically established CoQ10 dose for conception.

Research protocols differ considerably in:

• daily dose
• duration
• formulation
• participant age
• ovarian reserve
• fertility diagnosis
• IVF protocol

For this reason, comparing individual study doses does not produce a universally appropriate “fertility dose”.

Someone undergoing IVF or fertility treatment should discuss supplementation with their fertility specialist, particularly because supplements may form part of a broader treatment protocol.

Ubiquinone vs Ubiquinol for Fertility

CoQ10 supplements generally contain one of two forms:

Ubiquinone is the oxidised form of CoQ10.

Ubiquinol is its reduced form.

The body naturally converts between the two forms.

Ubiquinol is often marketed as being more bioavailable, but current fertility evidence does not establish that one form produces better pregnancy or live-birth outcomes than the other.

Therefore, claims that ubiquinol is definitively the “best CoQ10 for fertility” go beyond the available clinical evidence.

What About CoQ10 + PQQ?

Pyrroloquinoline quinone, or PQQ, is another compound studied for its relationship with cellular and mitochondrial biology.

This creates a mechanistic reason for interest in combinations containing CoQ10 and PQQ.

However, most of the fertility evidence discussed in this article evaluates CoQ10 rather than CoQ10-PQQ combinations.

Evidence for CoQ10 should therefore not be automatically transferred to combination products.

Does CoQ10 Help Male Fertility?

CoQ10 has also been studied in men with infertility, although this is a separate body of evidence.

A meta-analysis of three trials involving 296 men reported changes in measures such as:

• sperm concentration
• sperm motility
• seminal CoQ10 concentration

However, the analysis did not find evidence of increased pregnancy rates, and none of the included trials reported live-birth outcomes.

For couples trying to conceive, this reinforces an important principle: improvements in semen parameters do not necessarily prove an increase in the likelihood of conception.

Can CoQ10 Help You Get Pregnant Naturally?

At present, there is not enough high-quality evidence to say that CoQ10 increases natural conception rates.

Most favourable evidence comes from:

• IVF
• ICSI
• diminished ovarian reserve
• poor ovarian response
• other infertility populations

These are different from healthy couples trying to conceive without assisted reproductive treatment.

If you encounter a claim that CoQ10 “helps you get pregnant”, check whether the supporting study actually measured natural conception, IVF outcomes, embryo characteristics or simply laboratory biomarkers.

They are not interchangeable endpoints.

Clinical Pregnancy vs Live Birth: Why the Difference Matters

This may be the most important point in interpreting CoQ10 fertility research.

A clinical pregnancy is generally a pregnancy confirmed clinically, commonly through ultrasound evidence of a gestational sac.

A live birth means the pregnancy ultimately resulted in the birth of a living baby.

An intervention can increase the number of clinical pregnancies without necessarily producing a statistically demonstrated increase in live births.

For CoQ10, meta-analyses have reported encouraging results for clinical pregnancy, but evidence for live birth remains considerably less certain.

That is why saying:

“Studies have observed higher clinical pregnancy rates in some women undergoing ART”

is scientifically defensible.

Saying:

“CoQ10 increases your chances of having a baby”

currently is not.

What Does the Evidence Mean for Someone Trying to Conceive in India?

CoQ10 is widely available as a dietary supplement in India, but availability should not be confused with an established fertility recommendation.

If someone is experiencing difficulty conceiving, supplementation should not delay a fertility assessment.

Evaluation may need to consider factors such as:

• age
• ovulation
• ovarian reserve
• reproductive anatomy
• thyroid and metabolic health
• semen parameters
• duration of infertility
• previous pregnancy history

For individuals undergoing IVF or ICSI, a fertility specialist can determine whether an adjunct such as CoQ10 is appropriate within the context of their treatment.

When Should You Speak to a Fertility Specialist?

Consider seeking professional fertility advice rather than relying on supplements alone if:

• you are under 35 and have been trying to conceive for 12 months without success
• you are 35 or older and have been trying for six months
• you have irregular or absent periods
• you have a known reproductive condition
• you have previously been told you have diminished ovarian reserve
• there is a known or suspected male fertility factor
• you are preparing for IVF or another assisted reproductive treatment

Individual circumstances can justify assessment earlier.

Should You Continue CoQ10 After Conception?

The evidence discussed above relates primarily to preconception and assisted reproductive treatment.

Pregnancy is a separate question.

CoQ10 is not a standard antenatal supplement, and evidence establishing its safety during pregnancy remains limited.

If CoQ10 has been used as part of an IVF or fertility protocol, a positive pregnancy test is an appropriate point to review its continuation with the fertility specialist or obstetrician managing the pregnancy.

Do not assume that a supplement used before conception should automatically be continued during pregnancy.

The Bottom Line

CoQ10 has a credible biological connection to reproductive science because oocyte development depends heavily on mitochondrial energy production and cellular redox balance.

Human research has observed differences in ovarian response, retrieved oocytes and embryo-related measures in certain infertility populations.

More importantly, meta-analyses have reported higher clinical pregnancy rates in women receiving CoQ10 during assisted reproductive treatment, particularly among women with diminished ovarian reserve.

But the evidence has important limitations.

Results are not uniform across trials, natural conception has not been adequately studied, and an improvement in live-birth rate has not been convincingly established.

The most accurate interpretation today is therefore:

CoQ10 is a promising and actively studied fertility adjunct, particularly in IVF and diminished ovarian reserve, but it is not a proven treatment for conception or a guarantee of improved egg quality.

Frequently Asked Questions

Does CoQ10 help you get pregnant?

Some studies of women undergoing IVF or ICSI have observed higher clinical pregnancy rates with CoQ10 supplementation. However, evidence is not sufficient to conclude that CoQ10 increases the chance of natural conception or live birth.

Does CoQ10 improve egg quality?

CoQ10 has been studied because of its role in mitochondrial function and antioxidant defence. Some studies have observed changes in oocyte and embryo-related outcomes, but human evidence does not conclusively prove that CoQ10 improves egg quality.

Can CoQ10 improve clinical pregnancy rates?

Meta-analyses of fertility trials have reported higher clinical pregnancy rates among some women receiving CoQ10, particularly during ART and in diminished ovarian reserve populations. Individual trials have not always found the same result, so further high-quality research is required.

Is CoQ10 useful for diminished ovarian reserve?

This is one of the populations in which CoQ10 has been studied most extensively. Trials have observed changes in ovarian response, oocytes retrieved and clinical pregnancy rates, but evidence remains insufficient to consider CoQ10 an established treatment.

How long should you take CoQ10 before trying to conceive?

There is no established duration. Clinical studies have used pretreatment periods ranging from several weeks to months. One notable IVF trial used 60 days of supplementation before ovarian stimulation.

What is the best CoQ10 dose for fertility?

There is no universally established fertility dose for CoQ10. Research protocols vary considerably, so a study dose should not be interpreted as an individual recommendation.

Is ubiquinol better than CoQ10 for egg quality?

Ubiquinol is a reduced form of CoQ10. Although differences in absorption are discussed, fertility research has not established that ubiquinol produces better pregnancy or live-birth outcomes than ubiquinone.

Can I take CoQ10 during IVF?

CoQ10 has been investigated as a pretreatment in IVF and ICSI studies. Anyone undergoing fertility treatment should discuss supplements with their fertility specialist because the appropriate protocol depends on the individual treatment plan.

Does CoQ10 help fertility after 35?

CoQ10 is being investigated in reproductive ageing because mitochondrial function changes with age. However, current evidence does not establish that CoQ10 reverses age-related fertility decline or improves conception in every woman over 35.

Should CoQ10 be stopped after a positive pregnancy test?

Pregnancy safety is a different question from preconception use. CoQ10 is not a routine prenatal supplement, so continuation after a positive test should be reviewed with the treating fertility specialist or obstetrician.

References

1. Florou P, et al. Does coenzyme Q10 supplementation improve fertility outcomes in women undergoing assisted reproductive technology procedures? Journal of Assisted Reproduction and Genetics. 2020. Systematic review and meta-analysis of randomised controlled trials.
2. Xu Y, 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. Journal of Ovarian Research. 2018.
3. 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.
4. Abdelrahman MA, et al. Coenzyme Q10 Impact on Ovarian Reserve Measures and the Intra-Cytoplasmic Sperm Injection Outcomes in Women with Poor Ovarian Response: A Randomized Controlled Study. Drug Design, Development and Therapy. 2026.
5. Rodríguez-Varela C, Labarta E. Does Coenzyme Q10 Supplementation Improve Human Oocyte Quality? 2021.
6. Ben-Meir A, et al. Coenzyme Q10 restores oocyte mitochondrial function and fertility during reproductive aging. Aging Cell. 2015. Primarily experimental and animal evidence.
7. Lafuente R, et al. Coenzyme Q10 and male infertility: a meta-analysis. Journal of Assisted Reproduction and Genetics. 2013.