Ubiquinone vs Ubiquinol: Which Form of CoQ10 Should You Take?

Key Takeaways

• Ubiquinone and ubiquinol are two forms of one nutrient, CoQ10. Your body turns one into the other, so most of what ends up in your blood is ubiquinol either way.
• The human research splits. Two small trials found ubiquinol raised blood levels more. Two found no clear difference.
• For most people, ubiquinone vs ubiquinol matters less than the dose and the way the capsule is made.
• The case for ubiquinol is a little stronger with age. It rests on one small trial, and a larger trial in older adults found no difference.
• Both of the long trials that tracked heart outcomes used ubiquinone, at 200 mg and 300 mg a day. One enrolled adults with heart failure. The other gave selenium alongside it.

You are standing in front of two bottles of CoQ10. One says ubiquinone, or ubidecarenone, which is the same thing under its drug name. The other says ubiquinol, and it costs roughly twice as much. The label on the expensive one probably says something about being the “active” or “reduced” form, and the question you actually want answered is whether that premium buys you anything.

It does not, for most people. Ubiquinone vs ubiquinol is a question about two chemical states of one molecule, and the human evidence comparing them is thinner and more mixed than the price gap suggests. Both forms raise CoQ10 in your blood, and both end up circulating as the same thing. The trials that tracked people for years and measured real outcomes happened to use ubiquinone.

Two groups have a stronger case for paying up: older adults, and anyone who has taken ubiquinone without seeing a measured level move. The evidence behind both is thin, and the rest of this piece is why.

What Is Ubiquinone?

Ubiquinone is the oxidized form of coenzyme Q10, the state the molecule is in when it is ready to accept electrons. It shows up on some labels and in most drug references under its official drug name, ubidecarenone. Ubiquinone, ubidecarenone and CoQ10 in its oxidized state are three names for one compound.

Inside your mitochondria, CoQ10 works as a shuttle. Ubiquinone is the empty shuttle. It picks up electrons as they move down the electron transport chain that produces most of your cellular energy, hands them off, and comes back for more. This is the role that puts CoQ10 in the Power Plant pillar of the Four-Pillar Framework.

Ubiquinone is also the form used in most of the published CoQ10 research. It is chemically stable, which matters for a product meant to sit on a shelf and then in a cabinet, and stability is one of the quieter reasons why the form of an ingredient changes how much you absorb.

It is also hard to absorb. CoQ10 is a large, fat-soluble molecule, and absorption is slow, limited, and gets less efficient as the dose climbs. That is true of both forms.

What Is Ubiquinol?

Ubiquinol is the reduced form of coenzyme Q10, the state the molecule is in after it has picked up electrons. It is also the form that most of the CoQ10 in your bloodstream takes. A bottle labelled ubiquinol CoQ10 holds this state, and labels commonly call it the “active form,” which is accurate about the chemistry and silent on whether it absorbs any better.

The fact itself is solid. Work going back to the early 1990s found that roughly 80% of the coenzyme Q10 circulating in human blood is present as ubiquinol, and later absorption studies put the figure closer to 95%. Your blood carries CoQ10 mostly in the electron-carrying state.

The inference people draw from that fact is where the reasoning outruns the evidence. If ubiquinol is what circulates, the reasoning goes, then swallowing ubiquinol should skip a step. The hypothesis is reasonable. It has been tested four times in humans.

Ubiquinol also rides inside your lipoproteins, the particles that ferry fats around the bloodstream. In laboratory testing, LDL taken from people supplemented with CoQ10 was slower to begin oxidizing. That is a test-tube result rather than a health outcome, but it is part of why CoQ10 comes up in discussions of oxidative balance.

Ubiquinol is the less chemically stable of the two forms. It is inherently unstable and oxidizes back to ubiquinone unless the capsule protects it, which is a real part of why ubiquinol CoQ10 costs more. The same tension between a more active form and a more stable one shows up in vitamin E, where mixed tocotrienols and tocopherols raise a near-identical question.

How Your Body Converts One Form Into the Other

Your body converts ubiquinone to ubiquinol during absorption, which is why what reaches your bloodstream looks similar no matter which form you swallowed. The switch happens as the molecule crosses the gut wall, most likely in the lymph, the fluid that carries absorbed fat away from your gut, before it reaches your bloodstream.

Several enzyme systems do this work, including cytochrome b5 reductase, NQO1, and thioredoxin reductase. Three separate systems doing the same job is a sign of how routine the switch is. That same back-and-forth recycling runs throughout the body, and it is the principle behind how alpha-lipoic acid regenerates other antioxidants. A 2020 review of the absorption process concludes that CoQ10 travels through your blood as ubiquinol no matter which form you swallowed.

The older human data agrees. When volunteers took ubiquinone, ubiquinol levels rose in plasma and in every lipoprotein the researchers measured, and the ratio between the two forms stayed put. A 2020 study in healthy adults aged 65 to 74 found the same thing from the other direction. CoQ10 showed up in the blood mostly as ubiquinol even when people swallowed it as ubiquinone.

Whatever form you swallow, your blood carries CoQ10 mostly as ubiquinol. The open question is how much of it arrives.

So you swallow one state and your blood carries the other. Since the same molecule arrives either way, the question becomes how much of it arrives.

CoQ10 vs Ubiquinol: Why That Comparison Is a Category Error

CoQ10 vs ubiquinol is not a real comparison, because ubiquinol is CoQ10. The phrase turns up constantly on labels and in search boxes, and it usually means one of two things.

Sometimes it means ubiquinone vs ubiquinol, the two states this article compares. More often it means a product marked simply “CoQ10,” which is almost always ubiquinone, set against one marked ubiquinol CoQ10. In that case you are back to the same question under a looser name.

So CoQ10 vs ubiquinol is worth untangling before you compare prices, because a bottle that says only “CoQ10” has not told you which state is inside it. The next section is how to find out.

How Do You Tell Which Form Is in the Bottle?

Read the supplement facts panel rather than the front of the bottle, and look for the word next to the milligram amount. Ubiquinone vs ubiquinol is only a decision you can make once you know which one you are holding. That one line settles it for any brand, which is more useful than memorizing what any particular product contained last year.

Three patterns cover nearly every label on the shelf:

• The panel names ubiquinone, or its drug name ubidecarenone. Ubiquinone, ubidecarenone and “CoQ10 (as coenzyme Q10)” all point to the oxidized state.
• The panel names ubiquinol, often as “Kaneka Ubiquinol” or “reduced CoQ10.” Ubiquinol is nearly always named explicitly, because it is the more expensive input and brands want credit for it.
• The panel says only Coenzyme Q10 with no form given. Treat this as ubiquinone until the brand says otherwise. Ubiquinol is the premium ingredient, so a product containing it rarely stays quiet about that.

Two things on the panel matter more than the form word, and both are easy to check at the same time. The milligram amount tells you whether the dose is in the range the research used. The carrier, usually listed among the other ingredients, tells you whether the CoQ10 is dissolved in an oil-based soft-gel or sitting as dry powder in a hard capsule.

A brand that will not tell you the form usually will not tell you the rest either. That is the same test worth applying to any panel, and the reason to prefer products that name every ingredient and its amount instead of hiding them in a blend.

Ubiquinone vs Ubiquinol: How the Two Forms Compare

Side by side, the two forms differ clearly on chemical stability and price. Whether they differ on absorption is the part the trials disagree about.

The two columns describe two states of one molecule, and the differences that matter are absorption and price. One asymmetry is real: only ubiquinone has multi-year trials behind it that measured heart outcomes.

Ubiquinol vs Ubiquinone: What the Human Trials Show

Four human trials have tested ubiquinol vs ubiquinone head to head, each giving the same people both forms in turn. They disagree with each other.

The cleanest of the four controlled the one variable the others left loose. Twelve healthy volunteers took 200 mg a day of each form for four weeks, with a four-week break in between to clear the first form out, and both came in an identical soft-gel base, so the formulation could not skew the result. Total plasma CoQ10 rose from 0.9 to 2.5 µg/mL on ubiquinone and from 0.9 to 4.3 µg/mL on ubiquinol.

A 2018 trial in 10 older men pointed the same way. At 200 mg a day, ubiquinol raised total plasma CoQ10 to about 1.5 times each man’s own starting level, while ubiquinone’s rise did not reach significance, meaning it stayed within the range chance alone could produce. Look inside that result, though, and it splinters: six of the 10 men responded better to ubiquinol, and two responded better to ubiquinone.

A 2020 study in 21 healthy adults aged 65 to 74 compared several formulations at a 100 mg equivalent dose. Ubiquinol capsules produced about 1.7 times the level of ubiquinone capsules, but individual results varied enough that the difference did not reach significance (95% CI 0.9 to 3.1, p = 0.129, a range wide enough to include no difference at all). Note that this is a ratio between the two forms, where the 1.5-times figure in the older-men trial compares each man with his own starting level. A water-soluble syrup outperformed both capsule forms.

A 2018 trial in 11 healthy adults found ubiquinol higher in the raw numbers at the two-hour peak. The spread between individuals was wide enough that the difference could have been chance, and the authors concluded absorption varies a great deal from person to person and does not depend on which form you take. That trial measured a single dose over six hours rather than blood levels after weeks of daily use, so it answers a narrower question than the other three.

The most useful study of the group was not built as a form comparison at all. Researchers tested seven different CoQ10 products, all at 100 mg, in 14 volunteers. Bioavailability, meaning how much of a dose actually reaches your blood, differed significantly between products, and the two best-absorbed were both soft-gels, one containing ubiquinone and one containing ubiquinol. The base the CoQ10 was dissolved in mattered more than which form it was.

So: four head-to-head trials, sample sizes of 10 to 21, split two against two, with one of the two no-difference results resting on a six-hour test.

Manufacturer interests run through this literature, and they do not sort neatly onto one side. Q-SYMBIO drew partial support from Pharma Nord and from Kaneka, which manufactures ubiquinol, and KiSel-10 used a Pharma Nord ubiquinone product. The review this piece cites for how carrier oil and dispersion govern uptake was written by two Pharma Nord employees.

The two trials favoring ubiquinol have their own entanglements. The authors of the identical-base trial run a commercial CoQ10 laboratory, and its funding statement is not public. The older-men trial names a university as its sponsor and no industry partner.

What Is the Best Form of CoQ10? Formulation Outranks Form

The best form of CoQ10 is whichever one comes in a well-built capsule at a research-aligned dose, because how a capsule is made moves absorption more than which form is inside it. That is the most consistent finding in this literature.

CoQ10 has to be dissolved and dispersed before your gut can take it up. Poor crystal dispersion, meaning how finely the CoQ10 is broken up inside the capsule, can on its own cut how much of it you absorb by roughly 75%. That gap is in the same range as the largest difference any head-to-head trial found between the two forms, and sometimes larger.

The seven-product comparison points the same way. The two best-absorbed products in that test were both oil-based soft-gels, and one contained ubiquinone while the other contained ubiquinol. What separated those two from the other five was how they were built.

So the practical hierarchy runs dose first, formulation second, form third, which is why the amounts the research actually used matter more than the form name. Asked which CoQ10 is best, that order is the honest answer, and it puts ubiquinone vs ubiquinol last.

Where Ubiquinol Is the Better Choice

Ubiquinol has the better case with age, and that case is narrow.

The one trial that recruited specifically by age and found ubiquinol ahead was the 2018 trial in 10 older men. It is the strongest single result in favor of ubiquinol.

Set against it, the larger trial in adults aged 65 to 74 found no significant difference. Neither trial was big enough to settle the question, and the two used different doses, so the age case rests on a single small result.

The second case is more practical. If you have taken a ubiquinone product consistently for months and had your CoQ10 measured without seeing it move, switching to ubiquinol CoQ10 is a reasonable thing to try.

Response still varies a great deal between individuals, and one of the trials here concluded that the variability does not depend on which form you take. Check the dose and the formulation before you change anything else.

The science: CoQ10 in human tissue tends to peak in early adulthood and fall with age, by amounts that differ a lot from organ to organ. Whether older adults also absorb CoQ10 supplements less well has not been shown. It is the idea behind testing the two forms in an older group, not a finding. The evidence: Ten older men took each form for two weeks in random order, with a break in between, and neither the men nor the researchers knew which form was which. Ubiquinol raised total CoQ10 in the blood to about 1.5 times each man’s own starting level (Zhang et al., 2018, Food & Function). Ubiquinone did not raise any measure enough to count. Neither form changed CoQ10 inside immune cells. With 10 men, six of them doing better on ubiquinol, and a larger trial in adults aged 65 to 74 finding no significant difference, this reads as an early signal. What the studies used: The trial used 200 mg/day of CoQ10 as ubiquinol and 200 mg/day as ubiquinone. ResilienZ-12™ provides 200 mg of ubiquinone, matching the ubiquinone arm of that trial.

Studies cited above describe individual ingredients and biological mechanisms, not the ResilienZ-12™ formula. Ingredient and dose selection in ResilienZ-12™ is informed by this research, not equivalent to it.

Why ResilienZ-12™ Uses Ubiquinone

ResilienZ-12™ uses ubiquinone, so read this section as the reasoning behind a choice this brand made, not a neutral referee’s verdict, and check the sources for yourself.

The short version: the trials that followed people for years and measured outcomes instead of blood levels were run on ubiquinone, at 200 to 300 mg a day. That is the form and the dose ResilienZ-12™ uses, and of the three reasons behind the choice it carries the most weight.

Q-SYMBIO gave 300 mg a day of CoQ10 as ubiquinone to 420 people with long-term heart failure. Over two years it reported fewer deaths from heart-related causes in the CoQ10 group. Restricted to the European participants, the same direction of effect held.

KiSel-10 gave the supplement to 443 older Swedish adults for four years, inside a five-year trial. It also reported fewer deaths from heart-related causes.

That trial gave 200 mg a day of ubiquinone together with selenium and had no CoQ10-only arm, so it cannot separate what CoQ10 contributed from what selenium did. No comparable body of outcome evidence exists for ubiquinol, and absorption data and outcome data remain two separate bodies of research here.

The second reason is stability across a habit measured in years. ResilienZ-12™ is built for daily, long-term use, and the more chemically stable form is the steadier foundation for that.

The third reason is the hierarchy above. If formulation and dose outrank form, then the sensible move is to get the first two right and pick the form with the deepest evidence behind it.

The science: CoQ10 supports both the way mitochondria make cellular energy and the way the heart works. It has been studied for years at a time in people at higher risk of heart problems. The evidence: Q-SYMBIO followed 420 adults with long-term heart failure for two years. Half got CoQ10 and half got a placebo, a dummy capsule with nothing active in it. Nobody involved knew who got which. Serious heart events, including hospital stays and death, happened in 15% of the CoQ10 group and 26% of the placebo group (Mortensen et al., 2014, JACC: Heart Failure). Everyone in the trial had diagnosed heart failure, so the result describes that group and not a healthy one. What the studies used: The trial used 300 mg/day of CoQ10 as ubiquinone. ResilienZ-12™ provides 200 mg of ubiquinone, two thirds of the trial dose.

Studies cited above describe individual ingredients and biological mechanisms, not the ResilienZ-12™ formula. Ingredient and dose selection in ResilienZ-12™ is informed by this research, not equivalent to it.

Ubiquinone or Ubiquinol: How to Decide for Yourself

For most people taking CoQ10 as a daily habit, a well-formulated ubiquinone product at a research-aligned dose is a sound choice. Ubiquinol is the better bet if you are older, or if you already know ubiquinone has not moved your levels. Four situations cover most readers:

1. You are adding CoQ10 to a daily routine and have no history with it. Either form works. Spend your attention on the dose and the formulation rather than the word on the label. The companion piece on how much CoQ10 to take and when to take it covers the practical side, including what to do if you are on a statin.
2. You are in the age range the ubiquinol trials recruited from, roughly mid-sixties and up, or you have had CoQ10 measured on ubiquinone without seeing it rise. The ubiquinol evidence tilts your way, on one small trial. Try it, once you have checked the dose and the formulation.
3. You are comparing two products at the same price. Check the dose and whether the carrier is an oil-based soft-gel, then check whether the brand names every ingredient and amount instead of hiding them in a blend.
4. You are paying a large premium for ubiquinol on the strength of the “active form” claim alone. The evidence does not clearly support that premium for a general adult population. Four small trials have measured what the extra money buys, they disagree with each other, and two of them found no difference at all. Paying double on that basis is a stretch, and the same test applies to any longevity supplement carrying a premium.

Where the evidence cannot decide, as it cannot here, the practical answer is that the money is better spent on a well-formulated product at a serious dose than on the form name. ResilienZ-12™ uses ubiquinone, so check that reasoning against the sources rather than taking it on trust.

Frequently Asked Questions

Is Ubiquinol the Same as CoQ10?

Ubiquinol is one of the two forms CoQ10 takes, so yes, ubiquinol is CoQ10. Ubiquinone is the other form. Your body converts between them continuously as the molecule carries electrons inside your cells, and both raise the total CoQ10 circulating in your blood.

Is Ubiquinone the Same as Ubiquinol?

They are the same molecule in two different states, so they are not interchangeable words. Ubiquinone is CoQ10 carrying no electrons. Ubiquinol is CoQ10 carrying them. A bottle of one is not a bottle of the other, but your body converts what you swallow during absorption, so what circulates ends up much the same either way.

Which Is Better, Ubiquinol or Ubiquinone?

Neither form has clearly won. Four small human trials have compared them head to head, and two found ubiquinol raised plasma CoQ10 more while two found no significant difference. The case for ubiquinol is somewhat stronger in older adults, though it rests on one small trial that a larger one did not confirm. The long outcome trials used ubiquinone.

Which CoQ10 Is Best?

The best CoQ10 is the one with a research-aligned dose in a well-built capsule, and ubiquinone vs ubiquinol comes third. In one test of seven products at the same 100 mg dose, the two best absorbed were both oil-based soft-gels, one holding ubiquinone and one holding ubiquinol. Poor dispersion inside a capsule can cut absorption by roughly 75%, which is a bigger swing than any head-to-head trial found between the forms.

Is Ubiquinol Better Than CoQ10?

The comparison does not quite work, because ubiquinol is CoQ10. The question to ask is ubiquinone vs ubiquinol, two chemical states of the same nutrient. Comparing them is like comparing a full delivery van with the same van when it is empty.

What Is the Difference Between CoQ10 and Ubiquinol?

CoQ10 is the nutrient. Ubiquinol is its reduced state, the one carrying electrons. Ubiquinone is its oxidized state, ready to accept them. Most CoQ10 circulating in your blood is in the ubiquinol state regardless of which form you swallowed, because your body converts it during absorption.

Is Ubidecarenone the Same as Ubiquinone?

Yes. Ubidecarenone is the official drug name for ubiquinone, and it appears on some supplement labels and in most drug references. If you are weighing ubidecarenone vs ubiquinol on a label, you are weighing the same two forms this article compares, under a different name.

Can You Take Ubiquinol and Ubiquinone Together?

There is no reason to. Your body already converts between the two states constantly, so taking both adds cost without adding anything the conversion does not handle. If you want more CoQ10 reaching your blood, raise the dose or change the formulation rather than stacking both forms.

Should You Take Coenzyme Q10 as Ubiquinone or Ubiquinol After 60?

The coenzyme Q10 ubiquinone or ubiquinol question does shift slightly with age. Both trials favoring ubiquinol ran in healthy adults and older men. The multi-year trials that tracked heart outcomes used ubiquinone, and one of them recruited older adults specifically. If your levels have never been measured, either is defensible.

What This Means for Your Next CoQ10 Purchase

Buy on dose and formulation first, and treat ubiquinone vs ubiquinol as the third question rather than the first. Whether the panel says ubiquinone, ubidecarenone or ubiquinol CoQ10, the milligram amount and the carrier will tell you more about what reaches your blood than the form word will.

Human tissue CoQ10 tends to peak in early adulthood and decline with age, by amounts that differ substantially between organs. The practical problem is getting a serious amount of it into your blood every day, and that is a healthspan question more than a lifespan one.

ResilienZ-12™ provides 200 mg of CoQ10 as ubiquinone, the form the multi-year outcome trials used, as part of the Power Plant pillar.

FDA Disclaimer

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

This article draws on 13 peer-reviewed sources, all linked in the references below.

References