What do the states mean?+
- Solid: well studied, and it works.
- Half-there: the science is still forming.
- A ghost: almost no real studies.
- Hollow: well studied, and it does not work.
- A cord: the pair itself has been tested together.
- Air: nobody has ever tested this pair.
The full scoring method: How we score
CoQ10 benefits: where the science stands
For heart: yes.
Heart is what most people take CoQ10 for, and the strongest evidence says it helps (two combined reviews covering 23 trials). As of August 2026, the verdicts on this page rest on evidence from 39 trials, drawn from the strongest research among the 1,480 papers on PubMed that mention CoQ10. Every claim is checked below.
1,480 papers on PubMed · evidence from 39 trials
Claim by claim
- HeartWell studied, and it works. The biggest review covered 12 trials.
- EnduranceThe science is still forming. No real difference found so far.
Pairs people ask about
The three sources we read
- 2021Meta-analysis · pools 11 trials, 1,573 people · moderate benefit for heartsource
- 2023Meta-analysis · pools 16 trials · no clear effect on endurancesource
- 2024Meta-analysis · pools 12 trials, 489 people · small benefit for heartsource
Chosen as the strongest evidence out of 1,480 papers on PubMed. Every row links to its paper.
Fair questions
Does CoQ10 work?+
For heart, yes. The biggest review covered 12 trials.
Is CoQ10 safe?+
No caution is recorded on this page. That is not a safety guarantee; the studies we read were not safety trials.
Why only 3 sources, when PubMed lists 1,480?+
The 1,480 is every paper that mentions CoQ10 in any way: animal studies, blood measurements, papers where it is a side note. The strongest sources are combined reviews, and each one already gathers every trial its authors could find. Our 3 cover 39 trials between them, and every one is linked above. Both counts are measured, not estimated.