What do we know about Coenzyme Q10 and blood sugar?
In Coenzyme Q10: An Insider’s Guide, Dr. William Judy wrote about CoQ10 supplementation and blood sugar control. The book is available from amazon.com. ISBN: 978-87-7776-186-7.
The strongest finding comes from a 2026 review of data from randomized controlled trials of CoQ10 supplementation. The review shows that supplementary CoQ10 is associated with a modest reduction in fasting blood glucose. Thus, CoQ10 may have a real albeit relatively small glucose-lowering effect. In particular, individuals with diabetes may benefit [Musazadeh 2026].
What is the source of the CoQ10 and blood sugar control data?
Musazadeh et al carried out an umbrella review and meta-analysis of eight existing meta-analyses of data from randomized controlled trials. In the text that follows, we summarize their findings.
Did supplementary CoQ10 clearly lower HbA1c?
No. The overall evidence from clinical trials points toward possible improvement in blood sugar control. However, the study results are not consistent enough to say that supplementary CoQ10 lowers long-term blood glucose as measured by HbA1c.
What is HbA1c?
HbA1c is a blood test that shows an individual’s average level of blood sugar over the past two to three months. Basically, HbA1c gives a more sustained picture of an individual’s blood sugar level. For this reason, HbA1c is HbA1c measurements are much more important in diabetes management than fasting blood glucose measurements are.
Who may benefit from supplementary CoQ10’s effect on blood sugar?
Evidence from randomized controlled trials shows larger beneficial effects in individuals with diabetes than in healthy individuals. Thus, supplementary CoQ10 may correct or ameliorate a metabolic problem rather than produce a substantial glucose-lowering effect in individuals whose glucose regulation is already normal.
Accordingly, individuals with diabetes may reasonably view supplementary CoQ10 as a possible adjunctive treatment to conventional blood sugar management. But it is not reasonable to suppose that supplementary CoQ10 can prevent the onset of diabetes or replace glucose-lowering medication [Musazadeh 2026].
What about the CoQ10 dose-response relationship?
In 2022, Liang et al analyzed 40 randomized controlled trials. They found a U-shaped dose-response relationship for four major glycemic measures:
- fasting blood glucose
- fasting blood insulin
- HbA1c (blood glucose)
- HOMA-IR (insulin resistance)
Note that the beneficial effect of the supplementary CoQ10 extended to both glucose control and insulin sensitivity.
The benefits of supplementary CoQ10 increased as the dose rose toward roughly 100–200 mg/day. Then, at higher daily intakes, the extent of the benefit diminished. Liang’s analysis suggested that the best daily dose was approximately 100–200 mg of CoQ10 per day for metabolic health benefits [Liang 2022].
Conclusion: CoQ10 and blood sugar control
Musazadeh et al emphasize that the evidence is not yet strong enough to regard CoQ10 as an established stand-alone treatment for blood sugar control.
Overall, the beneficial effects of supplementary CoQ10 were more pronounced in participants with diabetes than in non-diabetic participants.
Supplementary CoQ10 is a “potentially useful adjunct” and not a “proven therapy” for blood sugar control.
Commercially available CoQ10 supplements vary in absorption and bioavailability. It is important to buy a scientifically documented CoQ10 supplement.
Sources
Liang Y, Zhao D, Ji Q, Liu M, Dai S, Hou S, Liu Z, Mao Y, Tian Z, Yang Y. Effects of coenzyme Q10 supplementation on glycemic control: A GRADE-assessed systematic review and dose-response meta-analysis of randomized controlled trials. EClinicalMedicine. 2022 Aug 3;52:101602.
Musazadeh V, Falahatzadeh M, Mahmoudinezhad M, Shahhooseini E, Jamali M, Pam P, Shidfar F. Effects of Coenzyme Q10 supplementation on glycemic control biomarkers: an umbrella review of meta-analyses of randomised controlled trials. Endocrinol Diabetes Metab. 2026 Mar;9(2):e70182.
The information presented in this review article is not medical advice. Readers should not use this information as medical advice.
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