CoQ10 and Fertility: What the Research Shows for Women and Men

CoQ10 is one of the supplements most often mentioned in fertility forums, and several brands sell it specifically for egg or sperm quality. This page summarizes what the research does and doesn't show, for women and for men, and what to check before buying. It replaces six earlier posts on CoQ10 and fertility.

This is not medical advice. If you are trying to conceive, especially with IVF or other treatment, talk to your fertility specialist before adding any supplement. Some clinics have their own protocols.

Why CoQ10 comes up

Eggs and sperm need a lot of energy to mature, and CoQ10 is part of how cells produce energy. CoQ10 levels fall with age. That gives researchers a reason to study it. It does not prove that taking it helps.

What studies in women show

The research is small. A few randomized trials, mostly in women undergoing IVF who had a low ovarian reserve, found improvements in some lab outcomes, such as the number of eggs retrieved or embryo quality, after taking CoQ10 for about 60 days before treatment. One frequently cited trial used 600 mg a day.

Systematic reviews of antioxidants for female subfertility, including a Cochrane review, rated the overall evidence as low quality. They could not say confidently whether supplements change live birth rates, which is the outcome that matters.

What studies in men show

Several small trials found CoQ10 improved sperm measures such as count or motility. A Cochrane review of antioxidants for male subfertility found low-certainty evidence that antioxidants as a group might improve live birth rates, with many studies small and at risk of bias. The evidence is promising, but it's still thin.

Timing and amount

Trials typically lasted about two to three months, roughly the time an egg or sperm takes to mature. Doses ranged from about 200 to 600 mg a day, usually split with meals. The time of day has not been shown to matter. See CoQ10 Dosage and Timing.

Which form?

Products sold for fertility often use ubiquinol and charge more for it. No fertility trial has shown that ubiquinol gives better results than ubiquinone. The trade-offs are in Ubiquinol vs. Ubiquinone.

"Fertility" on the label

Natalist and Nest Egg are two brands that market CoQ10 specifically for conception. A fertility-branded CoQ10 contains the same molecule as any other. Judge it on:

• amount per serving and form
• independent verification (USP, NSF or a certificate of analysis)
• price per 100 mg
• any extra ingredients, which you should run past your clinician, especially in a prenatal context

There isn't enough research to say CoQ10 is safe during pregnancy, so ask your clinician whether to stop once you conceive.

Related guides

• CoQ10 Supplements: How to Choose One