antioxidant · for high blood pressure
CoQ10
Helps the lining of your blood vessels work properly, so they relax more easily.
Say that in clinical terms
CoQ10 improves endothelial function by reducing oxidative stress and increasing nitric oxide bioavailability. It preserves nitric oxide from superoxide degradation and may directly relax vascular smooth muscle through bioenergetic mechanisms.
How strong is the research?
1 paper read, 1 supporting.
Who was studied: People with high blood pressure across 12 studies, 8 of which were open-label rather than blinded.
How much to take
daily with meals
100–300 mg
CoQ10 has modest antihypertensive effects. Allow 4-12 weeks for BP effects. Take with fat-containing meal.
Before you take it
- No established NIH ODS Tolerable Upper Intake Level (UL) for CoQ10; clinical studies have administered doses up to 1,200 mg/day without serious adverse events.
- Warfarin interaction: CoQ10 shares structural similarity with vitamin K2 and may reduce warfarin anticoagulant efficacy; INR should be monitored when initiating or stopping CoQ10 in patients on warfarin.
- Antihypertensive drugs: additive blood-pressure-lowering effect is possible; blood pressure should be monitored when CoQ10 is used concurrently with antihypertensive medication.
- Statins inhibit the mevalonate pathway and deplete endogenous CoQ10 synthesis; supplementation is commonly considered in statin-treated patients, but CoQ10 does not alter statin pharmacokinetics.
- GI effects (nausea, loose stools, epigastric discomfort) reported in some patients at doses above 200 mg/day; dividing the total daily dose reduces incidence.
- Asymptomatic LDH and hepatic transaminase elevations have been reported in some studies at doses above 300 mg/day; clinical significance is unclear.
- Pregnancy and lactation: safety not established; avoid without medical supervision.
- Additive hypotensive effect is particularly relevant in this population: patients taking antihypertensive medication who add CoQ10 may experience compounded blood pressure reduction; clinical monitoring is warranted when initiating supplementation in treated hypertensives.
When to take it
Best taken: with food
What we make of it
Only 3 of the 12 pooled studies were properly controlled trials.
The detail
The pooled analysis is real and correctly cited, covering 362 people across 12 studies. But only three of those were randomised controlled trials, covering 120 people between them. The rest were weaker designs.