What is the difference between ubiquinol and ubiquinone?

Ubiquinone is the oxidized form of CoQ10; ubiquinol is the reduced, active form. The body converts ubiquinone to ubiquinol after absorption, but this conversion requires enzymatic capacity that declines with age and can be impaired by statin medications. Ubiquinol bypasses this conversion step entirely. Clinical studies show ubiquinol achieves 3–4x higher plasma CoQ10 concentrations than ubiquinone at equivalent doses.

Should I take CoQ10 with statins?

Statins inhibit the mevalonate pathway, which is required for both cholesterol synthesis and CoQ10 biosynthesis. As a result, statin use can reduce endogenous CoQ10 levels. Many clinicians suggest CoQ10 supplementation for patients on statins, particularly those who report muscle discomfort. Ubiquinol is often preferred in this population because it does not require the conversion step that may be impaired. Consult your prescribing physician before adding any supplement to a medication regimen.

When is the best time to take CoQ10?

CoQ10 is fat-soluble and absorbs significantly better when taken with a meal containing dietary fat. Taking it with the largest meal of the day — typically dinner — is a practical approach for most people. Splitting the dose across two meals can also improve absorption compared to a single dose taken in a fasted state.

Moderate Evidence

Best Form of CoQ10: A Clinical Guide

CoQ10 exists in two interconvertible forms in the body: ubiquinone (oxidized) and ubiquinol (reduced). Both are sold as supplements, but they differ meaningfully in their pharmacokinetics. Ubiquinol is the form that participates directly in mitochondrial energy production and acts as a lipid-phase antioxidant. Under 40, healthy individuals convert ubiquinone to ubiquinol efficiently; that conversion capacity decreases with age and under statin use.

Updated 2026 · Reviewed by Dr. Brennan Commerford, D.C.

Our Recommendation

Our Pick

Ubiquinol

Ubiquinol is the active, reduced form of CoQ10 that cells actually use. It achieves 3–4x higher plasma concentrations than ubiquinone at equivalent doses and requires no metabolic conversion — an important consideration as the conversion capacity declines with age.

All Forms Compared

Best

Ubiquinol

Bioavailability

3–4x higher plasma levels vs ubiquinone

Best For

Adults over 40, statin users, mitochondrial support

The active reduced form — no metabolic conversion required.

Good

Ubiquinone

Bioavailability

Well-studied, lower cost

Best For

Adults under 40 with normal conversion capacity

Must be converted to ubiquinol after absorption. Effective in healthy young adults with intact conversion pathways.

Good

Nano-CoQ10 (Water-Soluble)

Bioavailability

Enhanced solubility profile

Best For

Those who prefer water-miscible formulas

Micronized particle technology improves dissolution; clinical data is less extensive than standard forms.

Avoid

Generic CoQ10 Powder (Low-Quality)

Bioavailability

Highly variable — often very low

Best For

N/A

CoQ10 is highly lipophilic and poorly absorbed without formulation technology. Unformulated crystalline CoQ10 has very limited absorption.

Frequently Asked Questions

What is the difference between ubiquinol and ubiquinone?: Ubiquinone is the oxidized form of CoQ10; ubiquinol is the reduced, active form. The body converts ubiquinone to ubiquinol after absorption, but this conversion requires enzymatic capacity that declines with age and can be impaired by statin medications. Ubiquinol bypasses this conversion step entirely. Clinical studies show ubiquinol achieves 3–4x higher plasma CoQ10 concentrations than ubiquinone at equivalent doses.
Should I take CoQ10 with statins?: Statins inhibit the mevalonate pathway, which is required for both cholesterol synthesis and CoQ10 biosynthesis. As a result, statin use can reduce endogenous CoQ10 levels. Many clinicians suggest CoQ10 supplementation for patients on statins, particularly those who report muscle discomfort. Ubiquinol is often preferred in this population because it does not require the conversion step that may be impaired. Consult your prescribing physician before adding any supplement to a medication regimen.
When is the best time to take CoQ10?: CoQ10 is fat-soluble and absorbs significantly better when taken with a meal containing dietary fat. Taking it with the largest meal of the day — typically dinner — is a practical approach for most people. Splitting the dose across two meals can also improve absorption compared to a single dose taken in a fasted state.

Ready to formulate with Ubiquinol?

Build your personalized formula with research-backed dosing.

Start My Formula

Deep dive: Ubiquinol research

Full ingredient spotlight with citations

View spotlight

FormulaForge formulates and sells supplements containing the ingredients discussed on this page. Our formulary recommendations are based on peer-reviewed bioavailability research. All cited studies are independently verifiable.

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.