The Short Answer
Ubiquinol and ubiquinone are the two forms of CoQ10. Ubiquinol is the "reduced" (active antioxidant) form and ubiquinone is the "oxidised" form — and your body constantly converts between the two. Head-to-head studies suggest ubiquinol tends to absorb better, especially in older adults, with some trials showing meaningfully higher blood levels. But ubiquinone is well studied, cheaper, and still effective — and much of the CoQ10 in clinical research is ubiquinone. For most people the disclosed dose, formulation and taking it with food matter more than the label word.
Here's the practical breakdown.
What's actually different
CoQ10 exists in your body in two interchangeable states:
- Ubiquinone — the oxidised form. It's the form used in the majority of long-standing clinical research and is more stable and affordable.
- Ubiquinol — the reduced form, which is the one that acts as an antioxidant. It's less stable (it oxidises in air) and generally more expensive.
Importantly, your body converts one into the other as needed. Even when you swallow ubiquinone, much of the CoQ10 that ends up circulating in your blood is in the ubiquinol form — and vice versa. So this isn't two different nutrients; it's two forms of the same one.
What the absorption studies show
CoQ10 is notoriously hard to absorb — oral absorption is low because the molecule is large and poorly water-soluble. Form is one of several things that influence how much gets in:
- Several crossover studies report that ubiquinol produces higher plasma CoQ10 levels than an equivalent dose of ubiquinone, with some showing multiple-fold differences in absorption.
- The advantage appears larger in older adults, whose ability to absorb and convert CoQ10 declines with age.
- That said, results vary between people and between formulations, and well-formulated ubiquinone (for example, oil-based softgels taken with food) still raises CoQ10 levels effectively.
The takeaway: ubiquinol has an absorption edge on paper, but formulation quality and taking it with a fatty meal often matter just as much as which form is on the label.
Which should you choose?
- If you're over ~40 or want maximum absorption per milligram, ubiquinol is a reasonable choice.
- If value and a long research track record matter, a well-formulated ubiquinone at an adequate, disclosed dose does the job — which is why it remains the form in much of the clinical literature.
- Either way: take CoQ10 with a fat-containing meal, look for a disclosed dose (not a hidden blend), and choose third-party tested products — especially if you compete.
For how much to take and why the dose matters, see CoQ10 for Athletes: Dosage, Benefits, and Why the Dose Actually Matters. If you're on a statin, see CoQ10 and Statins.
How FITCNT approaches it
FITCNT Heart Support delivers a disclosed 200mg of CoQ10 per serving — a clinically meaningful dose — alongside citrus bergamot, curcumin, vitamin D3, K2 and BioPerine to aid absorption, all third-party lab tested and banned-substance free. Taken with a meal as directed, it's built so the dose you see is the dose you get. For how CoQ10 pairs with bergamot, see Citrus Bergamot and CoQ10 for Athletes.
The Bottom Line
Ubiquinol is the active, better-absorbed form and can be the smarter pick if you're older or chasing maximum absorption; ubiquinone is cheaper, more stable, heavily researched and still effective. Your body converts between them regardless. In practice, a disclosed dose, good formulation, and taking it with food matter more than the word on the label. Check with your healthcare professional if you take medication or have a medical condition.
Frequently Asked Questions
Is ubiquinol better than ubiquinone?
Ubiquinol generally absorbs better, particularly in older adults, and is the active antioxidant form. But ubiquinone is well researched, more stable and still effective, so "better" depends on your age, budget and the formulation.
Does the body convert ubiquinone to ubiquinol?
Yes. Your body continually converts between the two forms, so much of the CoQ10 circulating in your blood ends up as ubiquinol even if you took ubiquinone.
Which form of CoQ10 should I take with a statin?
Either form can be used; clinical studies have used both. Taking it with a fat-containing meal and using a disclosed dose matters more than the form. Discuss it with your doctor.
How should I take CoQ10 for best absorption?
With a fat-containing meal, since CoQ10 is fat-soluble and poorly absorbed on an empty stomach. A disclosed dose and quality formulation also improve how much you actually absorb.
References
- Mei X, et al. "A Randomized, Double-Blind, Two-Treatment, Two-Period, Crossover Study Investigating the Systemic Bioavailability of a Novel Cocrystal Ubiquinol Formulation Compared with a Ubiquinone Formulation in Healthy Adults." Clinical Pharmacology in Drug Development. 2026. PMC
- "Bioavailability of Coenzyme Q10: An Overview of the Absorption Process and Subsequent Metabolism." Antioxidants. 2020. PMC
- "Comparative Bioavailability of Different Coenzyme Q10 Formulations in Healthy Elderly Individuals." Nutrients. 2020. PMC
This article is general information only and is not medical advice. Always consult your healthcare professional before starting any supplement, especially if you take medication or have a medical condition. Not suitable for individuals under 18.