CoQ10 supplements: ubiquinol vs ubiquinone, doses and statin questions

CoQ10 comes in two forms sold as supplements: ubiquinone (the oxidized form) and ubiquinol (the reduced form). Both are the same coenzyme, and the studies behind CoQ10 have mostly used doses from 100 to 300 mg a day, while many supplement labels list 30 to 100 mg. Whether ubiquinol is worth its higher price is not settled, and the statin question is best taken to your prescriber.

This guide sorts out the two forms, the dose ranges, what the statin studies found, and how to read a CoQ10 line on a label or sales page.

What is the difference between ubiquinone and ubiquinol?

The Linus Pauling Institute explains that coenzyme Q10 exists in three oxidation states: the fully reduced ubiquinol form, a radical semiquinone intermediate, and the fully oxidized ubiquinone form. Cells convert between them all the time. In its reduced form, the institute notes, CoQ10 is an effective fat-soluble antioxidant, and it also has a role in mitochondrial energy production.

A supplement can contain either form. Ubiquinone is the standard, older version. Ubiquinol is usually marketed as "more absorbable" or "active", and it usually costs more.

A 2020 randomized crossover study in 21 healthy adults aged 65 to 74 compared single 100 mg doses of different CoQ10 formulations. One formulation was 2.4 times more bioavailable than standard ubiquinone capsules, but the increase for the ubiquinol product (1.7-fold) was not statistically significant. The authors also reported no differences in the redox status of the absorbed CoQ10 between formulations, meaning that CoQ10 appeared in the blood mostly as ubiquinol even when it was consumed as ubiquinone. That is one small single-dose study, so treat it as a reason to be skeptical of a bold "ubiquinol absorbs better" line, not as a final answer.

How much CoQ10 do studies use, and what do labels show?

The Linus Pauling Institute says supplement doses for adults typically range from 30 to 100 mg a day, considerably higher than typical dietary intake of about 3 to 6 mg a day, which comes mainly from meat, poultry and fish. It also notes that CoQ10 is fat-soluble and best absorbed with fat in a meal, that doses above 100 mg a day are generally divided into two or three doses, and that less than 5% of an oral dose is thought to reach the circulation.

Studies mentioned by the same institute include a four-year trial in older adults that combined 200 mg a day of CoQ10 with 100 mcg of selenium, and short trials using 150 to 300 mg a day. Safety reports include no significant adverse side effects at doses as high as 3,000 mg a day for up to eight months in one trial, though a supplement label is not a reason to try those amounts.

When you compare a bottle to these numbers, look at three things: the amount per serving, the form named (ubiquinone or ubiquinol) and whether a fat source is included in the capsule.

The institute also reports that some people have had stomach symptoms such as nausea, diarrhea, appetite suppression, heartburn and abdominal discomfort, especially with daily doses of 200 mg or more, and that splitting doses above 100 mg into two or three parts may minimize them. For heart failure, it cites a meta-analysis of 14 randomized trials with 2,149 participants using 30 to 300 mg a day of CoQ10 alongside standard care, which reported fewer deaths and better exercise capacity but no effect on ejection fraction. Those were people under medical care for a diagnosed condition, not shoppers responding to an ad.

What have the statin studies found?

This is the question most CoQ10 buyers actually have. Statins are cholesterol-lowering medicines, and the Linus Pauling Institute notes that they can decrease circulating CoQ10 concentrations, although it says there is no evidence that this causes adverse side effects in statin-treated patients. The related question is whether CoQ10 helps with muscle aches on a statin.

The results conflict:

• A 2018 meta-analysis in the Journal of the American Heart Association pooled 12 randomized trials with 575 patients and concluded that CoQ10 supplementation ameliorated statin-associated muscle symptoms such as pain, weakness and cramps. It found no reduction in plasma creatine kinase.
• A 2020 systematic review in Atherosclerosis included 7 studies with 321 patients and found no benefit of CoQ10 for statin-associated myalgia, and no improvement in the share of patients staying on their statin.
• A 2015 randomized trial of 41 patients with confirmed statin myalgia used 600 mg a day of ubiquinol for 8 weeks and reported that CoQ10 did not reduce muscle pain. Marginally more subjects reported pain with CoQ10.

Reasonable scientists read these differently, which is why a sales page that says CoQ10 "fixes" statin side effects is going further than the evidence. If you have muscle pain on a statin, tell your prescriber. Do not stop the medicine on your own.

What else should you ask a doctor or pharmacist?

The Linus Pauling Institute reports that CoQ10 has been reported to decrease the anticoagulant effect of warfarin in a few cases, and that anyone on warfarin should not start it without consulting the clinician managing their anticoagulant therapy. It also says that because reliable data in lactating women are not available, supplementation should be avoided during breastfeeding, and it lists some gastrointestinal complaints among side effects.

Bring the bottle to your pharmacist and ask three questions: does it interact with anything I take, is the dose sensible for my situation, and is a supplement needed at all? This is general information, not medical advice.

How do CoQ10 offers look when we audit them?

We repeat only what each review records.

• The Advanced Mitochondrial Formula review notes the label discloses an amount for all 10 ingredients, which is rare, but CoQ10 is listed at 50 mg while the review's reference range for mitochondrial-support trials is 100 to 300 mg.
• The Pep Tonic review records coenzyme Q10 at 100 mg, which sits in the range seen on supplement labels, next to blends whose parts are not broken out.
• The CerebroZen review lists CoQ10 alongside lemon extract and magnesium citrate with no amounts stated, so it cannot be compared with any study.

You can browse related groups in the energy and wellness category and the heart health category. Our review method explains why a stated amount matters before we look at anything else.

A CoQ10 label checklist

1. Is the form stated: ubiquinone, ubiquinol, or just "CoQ10"?
2. Is the milligram amount printed per serving, and how many servings a day does the label suggest?
3. Is it inside a "proprietary blend" where the number is not broken out?
4. Does the sales page promise an outcome for a medical condition, such as statin side effects, without a study you can open?
5. Do you take warfarin, other blood thinners or blood pressure medicine? Ask first.
6. What is the refund policy? See the ClickBank refund guide before you buy.

FAQ

Is ubiquinol better than ubiquinone?

It is sold as better absorbed, but the small 2020 crossover study above found that the ubiquinol product's increase was not statistically significant, and the absorbed CoQ10 appeared mostly as ubiquinol either way. Ask a pharmacist whether the extra cost is justified for you.

How much CoQ10 should you take?

There is no official recommended intake. The Linus Pauling Institute says the National Academy of Medicine has no specific recommendation and that typical supplement doses range from 30 to 100 mg a day. Any dose beyond the label is a decision for your doctor.

Should you take CoQ10 with a statin?

The studies conflict, so it is a question for your prescriber. Do not stop a prescribed statin on your own because of something on a sales page.

When should you take CoQ10?

The Linus Pauling Institute says it is fat-soluble and best absorbed with fat in a meal, with larger daily doses divided into two or three parts.