Health Reference LibraryHow much CoQ10 should I take, and can you take too much?
This entry is part of the Nutri Tailor Health Reference Library — cited research on supplements, nutrients and adjacent areas of health.
Summary
One hundred to three hundred milligrams a day of ubiquinone is the range the trials used, with 100 mg the common supplement dose and 200 to 300 mg in the heart failure and migraine studies, always with a meal containing fat because absorption roughly doubles with food. There is no reference intake, because the body makes CoQ10, and no upper limit, with the published safety assessment putting the observed safe level at 1200 mg a day. Above 300 mg there is little extra benefit and more cost. Give it eight to twelve weeks, since blood levels rise slowly, and ask a clinic first if it manages your blood clotting.
Dose calculator: capsules to reach your CoQ10 target
Enter the daily amount of CoQ10 you are aiming for and see how many servings of each Nutri Tailor product reach it. Nothing you enter leaves this device. No AI is used.
This tool does arithmetic on the label figures. It is not personal dosing advice and it knows nothing about your history or blood results. The reference intake, the safe upper guide and the trial doses are on this page; talk to your GP or a registered nutritional therapist before changing what you take.
Effective dose
The reference intake is none; the body makes coenzyme Q10 and there is no reference intake. Most trials used 100 to 300 mg a day of ubiquinone, with 100 mg the common supplement dose and 200 to 300 mg the range in the heart failure and migraine studies. Take it with a meal that contains fat, because it is fat soluble and absorption roughly doubles with food. Give it eight to twelve weeks, since blood levels rise slowly.
Safety profile
How much is too much: no upper limit has been set; the published risk assessment put the observed safe level at 1200 mg a day, far above any supplement dose. CoQ10 is well tolerated; mild stomach upset and, in a few people, trouble sleeping if taken late are the reported complaints. Above 300 mg a day there is little extra benefit in the trials and more cost. Anyone whose blood clotting is managed by a clinic should ask before starting, as CoQ10 has been reported to interact with that. Ubiquinol is the reduced form and costs more; ubiquinone is the form most of the research used.
Guideline positions
NHS vitamins and minerals guidance for CoQ10. NIH Office of Dietary Supplements fact sheet for CoQ10 where one exists. The trial doses quoted above are from the sources listed on this page.
Practical framework
Capsules to reach the dose, from the Nutri Tailor range, all made in the UK: [coenzyme Q10 capsules](/products/co-enzyme-q10-100mg), 100 mg of ubiquinone per capsule, so one covers the common dose and two to three reach the trial range. To read your own result against the UK ranges, use the free blood test result interpreter. This is a summary of published research, not personal health advice. Talk to your GP or a registered nutritional therapist before changing what you take, especially if you are pregnant, have a diagnosed condition or are under ongoing care.
Common misconceptions
That more CoQ10 works faster: above the doses the trials used there is no extra effect, only more side effects. That the front of the bottle states the dose: read the per capsule figure and the serving size on the back. That the NHS figure is a toxic threshold: it is the level below which harm is unlikely, which is a different thing.
Sources
- 2026. What is CoQ10 good for, and does the evidence support taking it?. Nutri Tailor Health Reference Library.