CoQ10 and Male Fertility: Does It Improve Sperm? (UK 2026)

By Jordan Harvey  ·  7 August 2026  ·  9 min read

Does CoQ10 improve male fertility? Partly. In several randomised trials, coenzyme Q10 was associated with better sperm motility and, in some, higher sperm concentration. But that is a laboratory measure, not a baby: the same studies found no clear proof that CoQ10 raises pregnancy or live-birth rates. The evidence is real but modest.

That distinction — between what happens under a microscope and what happens in a nursery — is the whole story with CoQ10. This guide walks through what the randomised trials, the meta-analyses and the 2022 Cochrane review actually found, explains the difference between ubiquinone and ubiquinol, and sets honest expectations before you spend money.

What CoQ10 Is and Why Researchers Looked at Sperm

Coenzyme Q10 (CoQ10) is a fat-soluble compound your body makes itself. It sits inside the mitochondria — the tiny “power plants” of a cell — where it helps turn nutrients into energy, and it also acts as an antioxidant that mops up damaging molecules called free radicals.

Sperm are unusually dependent on both jobs. A sperm cell packs its mitochondria into the mid-piece just behind the head to power the tail, and because it carries very little repair machinery, it is vulnerable to oxidative stress. Researchers reasoned that a compound involved in both energy and antioxidant defence might matter for sperm that need to swim well — which is why CoQ10 has been studied in men with poor semen quality (Salvio et al., Antioxidants, 2021).

What the Evidence Actually Shows

1. The clearest signal is sperm motility Randomised trial

The most-cited randomised trial is from 2012. Researchers gave 228 men with idiopathic (unexplained) infertility either 200 mg of ubiquinol — the “active” form of CoQ10 — or a placebo, every day for 26 weeks. Compared with placebo, the ubiquinol group had higher sperm density (28.7 vs 16.8 million/ml), higher motility (35.8% vs 25.4%) and more normal-shaped sperm (Safarinejad et al., J Urol, 2012). When the men stopped taking it, the gains partly faded — a hint that any effect depends on continued use.

Pooling several such trials, a 2013 meta-analysis of three randomised studies (about 296 men) found CoQ10 was linked to improved sperm motility and concentration versus placebo (Lafuente et al., J Assist Reprod Genet, 2013). More recent pooled analyses have echoed the motility finding while being less consistent on concentration.

2. But there is no proof of more pregnancies or babies Key context

This is the part most CoQ10 articles quietly skip. Better numbers on a semen test are not the same thing as a pregnancy. The 2013 meta-analysis was blunt about it: “there is no evidence in the literature that CoQ10 increases either live birth or pregnancy rates,” and noted that none of the included trials even reported live births (Lafuente et al., 2013).

A 2021 systematic review reached the same conclusion, describing the pregnancy data as “sparse or anecdotal” and asking openly whether CoQ10 has a real effect on fertility or merely a “cosmetic” effect on lab values (Salvio et al., 2021). A 2025 meta-analysis of eight trials again found gains in motility and morphology, but examined semen and hormone measures — not clinical pregnancy or live birth (Akhigbe et al., Front Pharmacol, 2025).

3. The Cochrane view: possible, but uncertain

The most authoritative overview is the 2022 Cochrane review of antioxidants for male subfertility, which pooled 90 randomised trials of 18 different antioxidants — including CoQ10, zinc, selenium and vitamin C — across 10,303 men. It concluded that antioxidants may be associated with higher live-birth and clinical pregnancy rates, but rated the overall certainty of the evidence as low to very low, largely because many trials were small and at risk of bias (de Ligny et al., Cochrane Database Syst Rev, 2022).

Put together, the fair summary is this: CoQ10 has a genuine but modest track record for improving sperm parameters — especially motility — while proof that it leads to more babies is still missing. If you are trying to conceive, that is worth knowing before you decide. For the wider list of nutrients with fertility evidence, see our guide to the best fertility supplements for men.

Ubiquinone vs Ubiquinol: Do the Two Forms Differ?

CoQ10 supplements come in two forms, and the labels can be confusing. Both have been used in fertility research, and there is no strong head-to-head evidence that one is clearly superior for sperm — but the difference is worth understanding.

Doses above reflect what studies used and are not a recommendation. Speak to a pharmacist or GP before starting any supplement, especially if you take medication such as blood thinners.

How Long Would CoQ10 Take to Show Up in a Semen Test?

If you do decide to try CoQ10 with your clinician’s support, patience matters. Making a sperm cell — a process called spermatogenesis — takes roughly 74 days, plus a further couple of weeks for the sperm to mature and travel. In practice that means about three months before any nutritional change could be reflected in newly formed sperm.

This is exactly why the trials above ran for 26 weeks and measured outcomes at three to six months. A two-week trial tells you nothing. It also means the only reliable way to know whether anything changed for you is a repeat semen analysis arranged through your GP — not how you feel. For practical, evidence-led steps beyond supplements, see our guide on how to improve sperm quality.

Information Gain: Lab Numbers vs Real Fertility

Search results are full of pages telling men that CoQ10 “improves sperm.” What they rarely spell out is which sperm measure, and whether it matters for actually having a child. The honest reading of the evidence separates two very different things:

• Semen parameters (count, motility, morphology) — the numbers on a lab report. Here CoQ10 has a real, if modest, track record, most consistently for motility.
• Fertility outcomes (pregnancy, live birth) — the thing that actually counts. Here the evidence for CoQ10 is missing: reviewers note no trial has shown a rise in live births.

That gap is the most useful thing to take away. A supplement can move a lab value without moving your odds of a baby — and improving those odds usually depends on the wider picture: diet, weight, smoking, alcohol, heat and any underlying medical cause. Our male fertility diet guide covers the food side, and it is worth reading alongside anything you take.

Frequently Asked Questions

The Bottom Line

CoQ10 has a genuine but modest evidence base for male fertility. Randomised trials and meta-analyses link it — most consistently — to better sperm motility, and sometimes to higher concentration. But that is where the good news stops: reviewers are unanimous that no study has shown CoQ10 increases pregnancy or live-birth rates, and the 2022 Cochrane review rated the wider antioxidant evidence as low to very low certainty.

The practical plan is unglamorous but sound — get a proper GP assessment and semen analysis if you are trying to conceive, sort out diet, weight and lifestyle first, and treat any supplement as a possible add-on discussed with your clinician, not a fix. Blue Power is a daily foundation that includes Zinc and Vitamin C, but it does not contain CoQ10. You can also read our related guides on zinc and male fertility and how to improve sperm quality.