Does Coenzyme Q10 Thin the Blood?

2023-11-15 15:19:51

Coenzyme Q10 (CoQ10) is a vitamin-like compound that has gained popularity as an oral supplement, often used to support cardiovascular health. However, questions have arisen over whether CoQ10 may affect blood viscosity and clotting. This article will provide an overview of CoQ10, discuss scientific research on its blood thinning potential, and evaluate expert opinions on its safety and usage recommendations.

Overview of Coenzyme Q10

Coenzyme Q10, also known as ubiquinone, is a fat-soluble nutrient synthesized in the body and also obtained through food sources. It functions as an essential component of the mitochondrial respiratory chain, helping drive cellular energy production. CoQ10 also serves as a potent antioxidant within cell membranes.

Common dietary sources of Coenzyme Q10 powder include meat, fish, nuts, seeds, and vegetable oils. Supplemental forms include ubiquinone and ubiquinol, the reduced, more bioavailable form. The average daily CoQ10 intake from food is estimated at 3-5 mg. Doses used in supplements typically range from 50 to over 200 mg per day.

Factors Influencing Blood Thickness

Blood viscosity refers to the thickness or stickiness of blood. This is determined by several key parameters:

- Platelet aggregation - Activated platelets clump together to form clots. Blood thickness increases.

- Plasma proteins - Especially fibrinogen. Higher levels make blood more viscous.

- Red blood cell count - Higher hematocrit means thicker blood.

- Blood vessel health - Improved endothelial function promotes blood flow.

- Medications - Blood thinners like aspirin reduce clotting factors.

Thinner, less viscous blood is associated with improved circulation and reduced risk of thrombosis. Lifestyle factors like exercise, diet and supplements may influence these factors.

Scientific Studies on Coenzyme Q10 and Blood Thinning

Some research has analyzed the potential blood thinning effects of CoQ10 supplementation, with mixed results:

- A study on 21 healthy adults in the Journal of Cardiovascular Pharmacology found that 60 mg per day of CoQ10 reduced platelet aggregation over 14 days. No changes in fibrinogen or viscosity were found.

- However, a larger trial on 49 adults published in Medical Science Monitor saw no significant changes in platelet aggregation, coagulation or viscosity after 4 weeks of 100 mg/day of CoQ10.

- A different 4-week study in European Journal of Heart Failure on patients with chronic heart failure also saw no reductions in von Willebrand factor or fibrinogen levels. Exercise capacity improved.

- Research in the International Journal of Cardiology explored adding CoQ10 to the blood thinner warfarin in rats. CoQ10 partially counteracted warfarin's blood thinning effects.

- Overall, current research has not firmly established that standard CoQ10 supplementation meaningfully reduces blood viscosity or clotting in humans. More data from larger, longer clinical trials is still needed.

Expert Opinions and Recommendations

Given the relative lack of conclusive human data, expert perspectives remain cautious regarding definite blood thinning effects of CoQ10:

- Dr. Andrew Weil notes no proven interactions between CoQ10 and platelet function, but advises caution with combining CoQ10 with other anticoagulants.

- Dr. Ralph Felice advises those on blood thinners to consult their doctor before taking CoQ10, as effects on INR have not been well established.

- Dr. Peter Langsjoen observes no major bleeding problems with using CoQ10, even in combination with medications like warfarin. But prudent monitoring of coagulation status is advised.

- The National Institutes of Health (NIH) states there is insufficient evidence that CoQ10 affects bleeding risk, but also notes a theoretical possibility of interaction.

Overall, most experts acknowledge the potential exists based on limited evidence, but agree more data from robust human trials is still needed before drawing definitive conclusions.

Safety and Precautions with Coenzyme Q10

Current evidence suggests oral CoQ10 supplementation appears to have a low bleeding risk, but some basic precautions are recommended:

- Start with lower CoQ10 doses and monitor for any bleeding problems or changes in INR.

- Avoid combining with other natural blood thinners like vitamin E, garlic, ginger or ginkgo biloba.

- Inform your doctor if taking blood-thinning medications like warfarin, clopidogrel or aspirin before starting CoQ10.

- Measure baseline INR and get periodic monitoring of coagulation function.

- Discontinue CoQ10 and seek medical advice if unusual bleeding symptoms arise.

For most individuals, CoQ10 supplementation within standard dosage ranges appears to have a low hemorrhagic risk. But prudent monitoring is advised if on anticoagulant medications.

Does CoQ10 Promote Bleeding?

Based on current research, there is no clear evidence that oral CoQ10 supplementation significantly promotes bleeding events:

- Human trials have not conclusively found reduced platelet aggregation or blood viscosity with normal doses of CoQ10.

- Rat studies hint at possible interference with warfarin activity, but human data is lacking.

- No increased rates of hemorrhage were reported in clinical trials with CoQ10 alone. Case reports exist of interactions with warfarin.

- Observational data on patients taking CoQ10 have not indicated increased bleeding frequency or hemorrhagic complications.

- However, there are still few robust clinical trials evaluating bleeding risk. A theoretical interaction exists, though unproven.

- Individuals on anticoagulant medications should monitor INR and platelet function when starting CoQ10.

While more research would be beneficial, current evidence does not establish a clear bleeding risk at normally recommended CoQ10 doses of up to 200 mg per day.

What Happens When You Take CoQ10 Every Day?

Taking CoQ10 supplements regularly can have several beneficial effects:

- May help improve heart health and function in people with cardiovascular disease.

- Can increase energy levels and athletic performance by enhancing cellular energy production.

- May reduce muscle pain and damage after strenuous exercise.

- Helps lower oxidative stress and inflammation throughout the body.

- Potentially supports brain health and delays cognitive decline.

- Could improve sperm count and fertility in men.

- May help manage diabetes and blood sugar control.

- Provides antioxidant protection for the skin and may reduce wrinkles.

- No significant side effects reported with long-term use at moderate dosages.

- Well-tolerated, though mild gastrointestinal issues are occasionally reported.

- Supports healthy aging by reducing oxidative damage over time.

Further research is still needed, but CoQ10 is generally considered safe for long-term daily supplementation. Those over 40 may benefit the most.

What Vitamin Should Not Be Taken with CoQ10?

There are a few specific vitamin interactions to be aware of with CoQ10 supplementation:

- Vitamin K - Could potentially have additive blood thinning effects. Those on anticoagulants should exercise caution when combining high doses.

- Vitamin E - May also contribute to anticoagulant activity. Monitor INR and platelet function when taking large amounts.

- Vitamin A - High doses exceeded 10,000 IU daily could reduce CoQ10 bioavailability. Stick to RDA limits.

- Multivitamins - Check vitamin K and E levels if also taking CoQ10. Brands with low levels are likely safe.

- Niacin - At high therapeutic doses, niacin could reduce endogenous CoQ10 synthesis. Monitor closely.

Overall, most standard multivitamins or individual vitamins pose no issues at normal supplementation ranges. Just avoid extremely high doses of the fat soluble vitamins A, D, E and K alongside CoQ10.

What Do Cardiologists Say About CoQ10?

Many cardiologists recommend CoQ10 due to its beneficial effects on heart health:

- CoQ10 levels are depleted in heart disease. Supplementation may improve heart function and symptoms.

- Statin drugs also deplete CoQ10. Some cardiologists advise taking CoQ10 to counter this effect.

- May help manage high blood pressure. A meta-analysis found an average 11 mmHg reduction in systolic BP.

- Shown to reduce inflammation in cardiovascular disease which contributes to atherosclerosis.

- Powerful antioxidant activity protects LDL cholesterol from oxidation, helping prevent plaque buildup.

- Improves endothelial cell function which supports healthy vascular tone and blood flow.

- Patients with heart failure showed improved ejection fraction and walking distance with CoQ10.

- Few adverse effects reported. Considered safe even for long-term use.

Always consult your own cardiologist before starting CoQ10. But many do recommend it as an evidence-based supplement for supporting heart health.

What Are the Symptoms of Needing CoQ10?

Some common signs and symptoms that may indicate a need for CoQ10 supplementation include:

- Fatigue, weakness and low energy levels.

- Muscle aches, pain or cramps during or after exercise.

- Shortness of breath with regular activities or exercise.

- Headaches, dizziness, nausea, insomnia.

- High blood pressure or changes in heart rhythm.

- Numbness or tingling in hands and feet.

- Cognitive dysfunction or memory impairment.

- Vision problems like glare sensitivity or blurriness.

- Skin changes including wrinkles, dryness, thinning.

- Male infertility such as low sperm count or motility.

- Frequency of viral or bacterial infections.

While not definitive, presence of these symptoms along with risk factors like age, statin use or heart problems may warrant assessing CoQ10 status.

Which is Better for the Heart CoQ10 or Fish Oil?

Both CoQ10 and fish oil provide cardiovascular benefits, but through different mechanisms:

- CoQ10 is superior for boosting cellular energy production and antioxidant protection in the heart muscle itself.

- Fish oil provides anti-inflammatory effects and lowers blood triglycerides more effectively. Better for vascular health.

- CoQ10 levels drop with age and heart disease, making supplementation more urgent.

- Statins deplete CoQ10, so supplemental CoQ10 may offset this adverse effect. Not a concern with fish oil.

- For heart failure specifically, CoQ10 has been shown to improve symptoms, ejection fraction, and walking distance.

- Only CoQ10 appears to help lower blood pressure, likely by improving endothelial function.

- Fish oil thin the blood slightly, while CoQ10 does not significantly affect clotting.

Ideally, combining the cardiovascular benefits of both fish oil and CoQ10 supplementation is recommended for optimal heart health.


In summary, current research has not established definitive evidence that standard doses of oral CoQ10 supplementation significantly reduce blood viscosity, inhibit platelet aggregation, or increase bleeding risk. However, limited clinical data prevents drawing definitive conclusions on its blood thinning potential. Those on anticoagulant medications should exercise caution with CoQ10. For normal individuals, it appears well-tolerated and supplemented for various health benefits, especially cardiovascular protection. But until more robust human trials are conducted, a theoretical interaction with coagulation factors cannot be ruled out entirely.

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