If you have spent any time researching egg quality or fertility supplementation you will have come across CoQ10. It appears on almost every list of fertility supplements and is recommended by reproductive specialists and naturopaths alike. But most of the information available either oversimplifies what it does or buries the explanation in language that requires a biochemistry degree to follow.
This article is about what CoQ10 actually is, what it does inside the body specifically in the context of fertility, what the evidence says, and how to use it effectively.
What CoQ10 is
Coenzyme Q10, abbreviated to CoQ10, is a compound found in virtually every cell in the human body. It is not a vitamin in the traditional sense because the body produces it rather than depending entirely on dietary sources. It sits within the mitochondria, the energy producing structures inside cells, where it plays a central role in the production of ATP, the molecule that powers almost every biological process.
CoQ10 also functions as a powerful antioxidant, neutralising free radicals that would otherwise damage cell membranes, proteins, and DNA. This dual role as both energy facilitator and antioxidant is what makes it particularly relevant to fertility.
The body produces CoQ10 naturally but production declines with age. By the mid-thirties levels are measurably lower than in the twenties. By the forties the decline is more significant. This is one of the reasons fertility researchers became interested in CoQ10 supplementation as a potential intervention for age-related changes in egg and sperm quality.
Why it matters for eggs
Eggs are among the most metabolically demanding cells in the human body. The process of maturation, fertilisation, and the rapid cell divisions that follow in early embryo development require extraordinary amounts of energy. Eggs contain more mitochondria than almost any other cell type, precisely because the energy demands of early development are so high.
When mitochondrial function declines, the egg has less energy available for the processes of maturation and early development. This is one of the primary mechanisms behind the decline in egg quality that occurs with age. Chromosomal errors during cell division, which become more common in older eggs, are partly attributable to insufficient energy to complete the division process accurately.
CoQ10 supports mitochondrial function directly. By supplying the raw material the mitochondrial energy chain needs to function efficiently, it helps maintain the energy capacity of the egg during the critical 90 day window of follicular development. It also acts as an antioxidant within the follicular fluid, protecting the developing egg from oxidative damage.
Animal studies, particularly in mice, have shown that CoQ10 supplementation reverses age-related declines in egg quality, ovarian reserve, and fertilisation rates. Human studies have been smaller and less definitive, as is often the case in fertility research, but the results have been consistently encouraging.
A randomised controlled trial in women with poor ovarian response undergoing IVF found that those who supplemented with CoQ10 for 60 days before their cycle produced more eggs, had higher fertilisation rates, and had a higher proportion of high quality embryos compared to those who did not supplement. Other studies have shown improvements in ovarian response and embryo quality in older women and in women with diminished ovarian reserve.
The evidence is not yet strong enough to make definitive claims but it is consistent enough that CoQ10 is now routinely recommended by many reproductive endocrinologists, particularly for women over 35 or those with diminished reserve or poor response to previous IVF cycles.
Why it Matters for Sperm
CoQ10 is equally relevant to male fertility, though this is discussed far less frequently. Sperm are highly vulnerable to oxidative damage for the same reason eggs are their membranes are rich in polyunsaturated fatty acids that are particularly susceptible to free radical attack. The mitochondria in the midpiece of the sperm tail are responsible for generating the energy that powers forward movement. When mitochondrial function is impaired motility suffers.
Multiple studies have shown that CoQ10 supplementation improves sperm motility, sperm count, and sperm morphology in men with poor semen parameters. A meta-analysis of randomised controlled trials found significant improvements in all three parameters with CoQ10 supplementation compared to placebo. The effect on motility was the most consistent finding.
For couples where male factor is part of the picture, CoQ10 supplementation for both partners makes biological sense and is supported by the available evidence.
Ubiquinol versus Ubiquinone
CoQ10 exists in two forms. Ubiquinone is the oxidised form, which is the version found in most supplements. Ubiquinol is the reduced, active form that the body actually uses at the cellular level. To use ubiquinone the body must first convert it to ubiquinol.
In younger, healthy individuals this conversion happens relatively efficiently. With age and with certain health conditions, including insulin resistance and thyroid dysfunction, the conversion becomes less efficient. For this reason many fertility specialists and researchers recommend the ubiquinol form specifically, particularly for women over 35 or those with metabolic health challenges.
Ubiquinol is typically more expensive than ubiquinone but its superior bioavailability means lower doses are needed to achieve comparable blood levels.
How to take it
Doses used in fertility research typically range from 200mg to 600mg daily of CoQ10, with higher doses used for women with significantly diminished reserve or poor previous IVF response. Ubiquinol is generally used at the lower end of this range due to its better absorption.
Because CoQ10 is fat soluble it is best taken with a meal that contains fat to maximise absorption. Taking it earlier in the day rather than at night is preferable as it can occasionally be stimulating for some people.
The most important point about timing is that CoQ10 needs to be taken for at least 60 days and ideally 90 days before the intended conception attempt or IVF cycle to allow adequate time for tissue levels to build and for the supplement to influence the eggs that will matter in that cycle. Starting it the week before egg retrieval or ovulation is not effective.
CoQ10 is generally very well tolerated. Side effects are rare and typically mild, including occasional digestive discomfort or headache at higher doses. It does not interact with most medications but women on anticoagulants should discuss supplementation with their doctor as CoQ10 has mild vitamin K like activity.
Who should consider it
CoQ10 is worth considering for any woman who is actively trying to conceive, particularly if she is over 35, has diminished ovarian reserve, has had a poor response to previous IVF stimulation, has a history of poor embryo quality, or has a condition associated with increased oxidative stress such as PCOS, endometriosis, or insulin resistance.
It is also worth considering for male partners, particularly where semen analysis shows reduced motility, abnormal morphology, or elevated DNA fragmentation.
It is not a magic solution. No single supplement is. But in the context of a comprehensive approach to fertility optimisation that includes diet, blood sugar management, sleep, stress reduction, and targeted nutrient support, CoQ10 is one of the most evidence-informed additions available.
Three months. Good quality ubiquinol. Taken consistently with food. That is the practical starting point
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