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Ingredient guide

CoQ10 dosage: how much CoQ10 per day?

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated .

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

Human studies of CoQ10 have usually used 90 to 390 mg a day, and the best daily intake is unknown. Food supplies about 3 to 6 mg. A safety review found strong evidence of safety up to 1,200 mg a day, though its authors worked for a supplement trade group.1,2,3,4

Key facts

  • Typical diets give 3 to 6 mg a day, so study amounts are roughly 15 to 130 times what food provides.1,3
  • At the same 100 mg dose, a water-soluble syrup was absorbed 2.4 times better than standard capsules.5
  • In a review of trials, stomach side effects were no more common at 1,200 mg a day than at 60 mg.4
  • Long use of 300 mg a day has raised liver enzymes in some people, without liver damage.1

The amounts used in studies

Human studies of CoQ10 have usually used 90 to 390 mg a day, on a variety of dosing schedules.1

The best daily intake of CoQ10 is unknown.2

Daily amounts in the studies cited on this page4,5,6,7,8
StudyPeopleAmountLength
Crossover trial of two forms10 older men200 mg a day2 weeks on each form
Dose and timing trial60 healthy men100 or 200 mg a day, as one or two doses20 days
Single-dose absorption study21 adults aged 65 to 74100 mg once48 hours of blood tests
Food comparison studyHealthy adults30 mg once, in a meal or as capsulesSingle dose
Safety reviewMany clinical trialsUp to 1,200 mg a dayVaried

What changes with the dose

Raises blood levels of CoQ10*1,6,9

Moderate evidence

A 2025 meta-analysis of 24 placebo-controlled studies in healthy adults found that CoQ10 supplements consistently raised blood CoQ10. How much depends on the product. A National Institutes of Health summary notes that oil-based preparations are absorbed better than the plain compound. In one small crossover trial, 200 mg a day of ubiquinone for two weeks did not raise levels significantly in ten older men, while the same dose of ubiquinol did.

Amount studied: Usually 90 to 390 mg a day in human studies; 200 mg a day for two weeks in the crossover trial

In a 20-day trial in 60 healthy men, 200 mg a day of CoQ10 in oil-based soft capsules raised blood levels more than 100 mg a day did.7

Blood levels rise with the dose taken, but only up to a point.10

In a 2025 review of 24 trials in healthy adults, no stable pattern linked the dose or the length of use to exercise performance.9

So more CoQ10 lifts blood levels further, within limits. The trials in healthy adults have not found an amount at which exercise performance reliably changes.9,10

The same milligrams can deliver different amounts

Milligrams on a label are not the whole story. In the 20-day trial, CoQ10 dissolved in oil reached higher blood levels than the same amount of crystalline powder, and in older adults a water-soluble syrup beat standard capsules after a single dose.5,7

Because the body absorbs CoQ10 slowly and only in part, the formula can matter as much as the number printed on the front of the bottle.10

By age and sex

No source here sets different amounts by age or sex. Tissue levels fall with age, but that does not fix a dose. Two of the trials in the table enrolled only men, and a 2025 review asked for studies that compare men and women.1,6,7,9

Upper limits, and who should ask first

No official upper limit exists. A risk assessment by a supplement trade group named 1,200 mg a day the observed safe level, and an NIH summary reports no serious toxicity.1,4

Some side effects are tied to dose. Mild trouble sleeping has been seen at 100 mg a day or more, and raised liver enzymes with 300 mg a day taken for long periods.1

  • Ask first if you take warfarin or another blood thinner
  • Ask first if you use insulin or other medicines that lower blood sugar
  • Ask first if you are pregnant, nursing or under 18

Questions people ask

Is 200 mg of CoQ10 too much?

It is within the 90 to 390 mg a day that studies have usually used, and well below the 1,200 mg a day that a trade-group risk assessment called the observed safe level. Mild trouble sleeping has been reported from 100 mg a day.1,4

Is 100 mg a day enough?

In one 20-day trial, 100 mg a day in oil capsules raised blood levels, though 200 mg raised them more. Whether either amount changes how a healthy adult feels has not been shown.7,9

How much CoQ10 per day for a woman over 50?

No source sets a separate amount for women or for older adults, so the usual study range of 90 to 390 mg a day is the reference. Lower tissue levels with age do not, on their own, call for a larger dose.1

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Sources

  1. PDQ Integrative, Alternative, and Complementary Therapies Editorial Board. Coenzyme Q10 (PDQ): Health Professional Version. National Cancer Institute. Updated October 31, 2024. Opened 2026-10-07.
  2. Weber C, Bysted A, Hølmer G. The coenzyme Q10 content of the average Danish diet. Int J Vitam Nutr Res. 1997;67(2):123-129. Opened 2026-10-07.
  3. Pravst I, Zmitek K, Zmitek J. Coenzyme Q10 contents in foods and fortification strategies. Crit Rev Food Sci Nutr. 2010;50(4):269-280. Opened 2026-10-07.
  4. Hathcock JN, Shao A. Risk assessment for coenzyme Q10 (Ubiquinone). Regul Toxicol Pharmacol. 2006;45(3):282-288. Opened 2026-10-01.
  5. Pravst I, et al. Comparative Bioavailability of Different Coenzyme Q10 Formulations in Healthy Elderly Individuals. Nutrients. 2020;12(3):784. Opened 2026-10-01.
  6. Zhang Y, Liu J, Chen XQ, Chen CYO. Ubiquinol is superior to ubiquinone to enhance Coenzyme Q10 status in older men. Food Funct. 2018;9(11):5653-5659. Opened 2026-10-01.
  7. Singh RB, Niaz MA, Kumar A, Sindberg CD, Moesgaard S, Littarru GP. Effect on absorption and oxidative stress of different oral Coenzyme Q10 dosages and intake strategy in healthy men. Biofactors. 2005;25(1-4):219-224. Opened 2026-10-07.
  8. Weber C, Bysted A, Hølmer G. Coenzyme Q10 in the diet: daily intake and relative bioavailability. Mol Aspects Med. 1997;18 Suppl:S251-S254. Opened 2026-10-07.
  9. Deng H, et al. Coenzyme Q10 supplementation increases blood concentrations but shows limited and inconsistent effects on exercise performance: a systematic review and meta-analysis. Br J Nutr. Published online December 29, 2025. doi:10.1017/S0007114525106211. Opened 2026-10-01.
  10. Bhagavan HN, Chopra RK. Coenzyme Q10: absorption, tissue uptake, metabolism and pharmacokinetics. Free Radic Res. 2006;40(5):445-453. Opened 2026-10-07.

*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 page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.