Supplements · Metabolic & Cardiometabolic
coenzyme Q10 decreases blood pressure
In plain terms: Does CoQ10 lower blood pressure?
Part of: 🧪 coenzyme Q10
Contested—older small trials say yes but a Cochrane review and newer trials found no reliable effect, so it's not a dependable blood-pressure treatment.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
Genuinely **contested**. Older/smaller trials and a GRADE dose-response MA (26 RCTs, n=1831; SBP −4.77 mmHg in cardiometabolic disease, U-shaped optimum ~100–200 mg/day) point to a modest reduction — but the disconfirming evidence is substantial: a Cochrane review judged the trials unreliable/insufficient, a controlled-hypertension RCT with 24-h ambulatory BP found no effect, and healthy normotens
The evidence (10)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Zhao et al. 2022 · Adv Nutr | meta-analysis | supports | moderate | GRADE dose-response MA (26 RCTs, n=1831): SBP -4.77 mmHg in cardiometabolic disease; U-shaped, 100-200 mg/d optimal; GRADE moderate (SBP), lower for DBP. |
| Burke et al. 2001 · South Med J | RCT | supports | moderate | Double-blind RCT (isolated systolic hypertension, n=83): oral CoQ10 lowered systolic BP vs placebo. |
| Mori et al. 2009 | RCT | mixed | low | RCT in CKD: CoQ10 had only modest BP/heart-rate effects (omega-3 drove the clearer BP reduction). |
| Karimi et al. 2025 · Int J Cardiol Cardiovasc Risk Prev | meta-analysis | mixed | moderate | SR/MA of CoQ10 on BP and heart rate in adults: prior results inconsistent; effect on BP/HR not consistently significant across populations. |
| Li et al. 2025 · Clin Ther | meta-analysis | mixed | moderate | SR/MA in T2D: CoQ10 effects on lipid profile and BP suggested but not uniformly significant. |
| Rosenfeldt et al. 2003 · Biofactors | meta-analysis | supports | moderate | SR of 8 hypertension trials: mean SBP -16 / DBP -10 mmHg with CoQ10 (older, small trials). |
| Young et al. 2012 · Am J Hypertens | RCT | contradicts | moderate | Crossover RCT (metabolic syndrome, 24-h ambulatory BP): CoQ10 did NOT significantly reduce blood pressure. |
| Shah et al. 2007 · Ann Pharmacother | RCT | contradicts | low | RCT in healthy individuals: no significant hemodynamic/BP effect of CoQ10 (and no QTc prolongation). |
| Ho et al. 2016 · Cochrane Database Syst Rev | meta-analysis | contradicts | moderate | Cochrane review (primary hypertension): trials unreliable/insufficient — uncertain that CoQ10 lowers BP; no clinically significant effect established. |
| Singh et al. 1999 · J Hum Hypertens | RCT | supports | moderate | Double-blind RCT (hypertension + CAD): CoQ10 60 mg bid lowered SBP/DBP and improved insulin/glucose vs B-vitamin control. |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.