Ubiquinone vs ubiquinol: what's the difference, and does it actually matter?
If you've shopped for CoQ10, you've hit this fork: ubiquinone or ubiquinol? One is usually cheaper; the other is marketed as the "active", "superior", "more absorbable" form and priced accordingly. It's a genuinely confusing choice, made worse by the fact that most of what's written about it is trying to sell you the more expensive option.
We make a ubiquinone CoQ10, so you should read what follows knowing that. We've tried to write the version we'd want to read — the facts, the uncertainty named, and a clear steer on what actually matters. If we thought ubiquinol was obviously better, we'd tell you; the honest answer is that it isn't obvious at all.
They're the same molecule in two states
Start here, because it clears up most of the confusion. Ubiquinone and ubiquinol are not two different substances. They are the same compound — coenzyme Q10 — in two chemical states that your body converts back and forth:
Ubiquinone is the oxidised form. It's more stable and has been used in most of the published CoQ10 research over the decades.
Ubiquinol is the reduced form. It's less stable and is marketed as the "ready to use" form.
Your body doesn't keep them separate. It shifts CoQ10 between the two states continuously as part of normal cellular chemistry. So when a label sells you "the active form", the underlying reality is that your body is going to do its own converting regardless of which one you swallow.
The absorption question — what the evidence really shows
This is the crux, so here's the careful version.
The headline fact: around 90% of the CoQ10 circulating in your blood is in the ubiquinol form — no matter which form you took. Your body converts ubiquinone to ubiquinol during and after absorption. That single fact undercuts a lot of the "you must take the reduced form" marketing.
On whether ubiquinol is absorbed better, the studies genuinely disagree. Some crossover trials have reported higher blood CoQ10 levels after ubiquinol in certain groups. Other trials have found no statistically meaningful difference between the two forms. It is not a settled question, and anyone telling you it is settled is overstating the evidence.
What the more rigorous reviews keep concluding is this: the formulation of the supplement matters more than the form. CoQ10 in any form is fat-soluble and hard to absorb from a plain powder. How a product is built to overcome that — the delivery system, particle size, whether it's taken with fat — tends to make a bigger difference to how much reaches your blood than the ubiquinone-versus-ubiquinol label does. In fact, several well-formulated ubiquinone products have matched or beaten typical ubiquinol ones in absorption. Ubiquinol's inherent instability can also work against it.
The other thing worth knowing: absorption varies a lot between individuals. Two people taking the exact same product, same dose, can end up with different blood levels depending on their digestion, dietary fat, age and metabolism. So the "best form" question has no universal answer even before you get to the form-versus-formulation debate.
So which should you choose?
Here's an honest decision framework, not a sales pitch.
Judge the whole product, not just the form word. Form is one input. Dose, third-party testing, manufacturing standard and delivery format matter at least as much. A carefully-formulated ubiquinone at a fair price can be a better buy than a poorly-formulated ubiquinol at a premium.
Don't pay a premium for the word "ubiquinol" alone. If a ubiquinol product costs significantly more purely on the promise of superior absorption, the evidence doesn't clearly back that promise. Pay for testing, dose and formulation — things you can verify.
Take it with fat, whichever you choose. Because CoQ10 is fat-soluble, it's generally taken with a meal containing some fat. That practical step likely does more for your absorption than agonising over the form.
Be wary of any brand overclaiming. In the UK, no health claims are authorised for CoQ10 in either form. If a product promises energy, heart benefits or anti-ageing, it's making claims that aren't allowed — a reason to be cautious about the whole brand.
Where Ivvion sits, plainly
Our CoQ10 is ubiquinone, 100 mg per daily serving, in a liposomal delivery format, third-party tested by batch and made in the UK under GMP.
Ivvion CoQ10 100mg — £24.99, or £21.24/month on Subscribe & Save →
We chose ubiquinone deliberately: it's the form with the deepest research history and it's more stable, which matters for a compound that degrades easily. And we put the effort into the delivery format, because — as above — that's the part the evidence says matters most. We're not going to claim it's "better absorbed" as a bare statement, because absorption varies between individuals and depends on how you take it. We'll tell you exactly what it is and how it's made, and let you judge against the framework above.
Frequently asked questions
Is ubiquinol better than ubiquinone?
Not clearly. Around 90% of circulating CoQ10 becomes ubiquinol whichever form you take, and absorption studies are mixed. Most reviews conclude the formulation matters more than the form.
Why is ubiquinol more expensive?
Largely because it's marketed as the "superior active form". The evidence doesn't clearly justify a big premium for the form alone — judge products on dose, testing and formulation, not just the word.
Which form does the body use?
Both — it converts CoQ10 between the two states continuously. The reduced (ubiquinol) form dominates in the blood regardless of which you supplement.
Should I take CoQ10 with food?
It's generally taken with a meal containing some fat, because CoQ10 is fat-soluble. Follow the specific product's label.
Does the form affect what CoQ10 does for me?
We can't answer that, because no health claims are authorised for CoQ10 in the UK in either form. We can only tell you what the forms are and how they're absorbed, not what they'll do for you.
Food supplement. Not a medicine. Does not diagnose, treat, cure or prevent any disease. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle.