CoQ10 for Egg Quality: What the IVF Trials Actually Found

If you’ve been trying to conceive for a while, especially if you’re past 32 or 33, someone has probably mentioned CoQ10 to you. A friend, a Reddit thread, maybe your IVF doctor.

It’s one of the few fertility supplements with actual randomised trials behind it. But the way it gets talked about online (“CoQ10 fixes egg quality!”) is a lot more confident than the research. So here’s what the studies really found, and who they apply to.

Why eggs need so much energy

An egg is the largest cell in the human body. And it’s one of the hungriest for energy.

That energy comes from mitochondria, the tiny power plants inside every cell. A mature egg has far more mitochondria than an ordinary cell, because maturing, dividing its chromosomes correctly and supporting an early embryo all take enormous energy.

Coenzyme Q10 (CoQ10) is a molecule your mitochondria need to make that energy. Your body makes its own, but levels fall with age. That’s the core idea behind using it for fertility: older eggs may be working with tired mitochondria, and CoQ10 is part of the machinery that powers them.

It’s a reasonable theory. Here’s what happened when researchers tested it.

What the trials found

The most cited study was a randomised controlled trial published in 2018. Researchers took 186 women under 35 with low ovarian reserve who were about to start IVF. Half took 600 mg of CoQ10 a day for 60 days before their cycle; half took nothing.

The CoQ10 group:

• needed less stimulation medication,
• responded better to stimulation,
• and had fewer embryo transfers cancelled because of poor embryo development.

Since then, meta-analyses pooling several trials have generally found CoQ10 associated with better outcomes in women who respond poorly to IVF stimulation.

The fine print that matters

This is where most blogs stop. Please read this part.

1. The strongest evidence is in a specific group: women with low ovarian reserve, or who responded poorly to IVF, usually in an IVF setting.
2. For women with normal ovarian reserve, or for natural conception, the evidence is much thinner.
3. The doses were high. Most fertility trials used 200 to 600 mg a day, often split across meals, for at least 60 days.

That third point matters when you’re comparing products. A capsule with 30 mg of CoQ10 isn’t what was studied. Check the label of whatever you take, ours included.

Ubiquinone vs ubiquinol

You’ll see two forms on labels.

• Ubiquinone is the oxidised form. Your body converts it into ubiquinol before using it.
• Ubiquinol is the reduced, active form. It’s generally considered easier to absorb, especially as conversion becomes less efficient with age.

Both have been used in fertility research. CoQ10 is fat-soluble, so take it with a meal that has some fat in it, whichever form you choose.

Timing: why 90 days

An egg doesn’t develop in a month. The final growth phase before ovulation takes roughly three months. So whatever you change today, diet, sleep, supplements, mainly shows up in the eggs you ovulate around three months from now.

That’s why fertility specialists talk about a 90-day pre-conception window, and why the trials ran for at least 60 days. Starting CoQ10 two weeks before an IVF cycle isn’t really in line with the evidence.

Should you take it?

Speak to your gynaecologist or fertility specialist, especially if you’re already in treatment. They may suggest it if you’re over 35, have low AMH, or have had a poor response to stimulation before.

CoQ10 is generally well tolerated. It may interact with blood thinners such as warfarin, so tell your doctor if you take one.

Why it’s the hero of Her Genesis

CoQ10 is the reason Her Genesis exists. We built it around branded Kaneka CoQ10, from the Japanese company that produces some of the most widely researched CoQ10 in the world, alongside folate in its active L-5-MTHF form. It uses ubiquinol, with 100 mg per daily serving.

It’s meant to support your pre-conception preparation alongside your doctor’s care, not replace it.

FAQ

Does CoQ10 improve egg quality?

Randomised trials show CoQ10 is associated with better IVF responses and embryo development in women with low ovarian reserve. Evidence for women with normal reserve is limited.

How much CoQ10 should I take for fertility?

Most fertility trials used 200 to 600 mg a day for at least 60 days. Ask your doctor what’s right for you.

How long before IVF should I start CoQ10?

The main trial used 60 days. Many specialists suggest around three months, matching the time an egg takes to mature.

Is ubiquinol better than ubiquinone?

Ubiquinol is the active form and is generally considered easier to absorb, especially with age. Both forms have been used in fertility research.

This article is for general information and isn’t medical advice. CoQ10 supplements aren’t intended to diagnose, treat, cure or prevent any disease, including infertility.

Also read: Folic acid vs methylfolate