CQ10 Side Effects & Health Benefits

CQ10 Side Effects, Health Benefits, Recommended Dosage:

CQ10, also known as, in its various forms, Coenzyme Q10, CoQ10, ubidecarenone, ubiquinone, coenzyme Q, is a fat-soluble antioxidant, primarily synthesized by the body.

It is found in almost every cell in the body and aids mitochondria during energy production.

Antioxidants are an important part of optimal health. When antioxidant levels in the body are lower than that of free radicals (toxins exposure due to poor nutrition or other factors), oxidation wreaks havoc in the body.

Furthermore, many studies show that free radicals can contribute to the development of cardiovascular disease, cancer, cataracts, brain dysfunction, and more. Hence, antioxidants may help maintain ideal well-being and health.

This antioxidant was first identified in 1957 by Professor Fredrick L. Crane. Its chemical structure was determined in 1958. It is mainly found in most body tissues.

The highest amounts are found in the heart, kidneys, liver, and pancreas. The lowest amounts are found in the lungs.

It’s not a vitamin

The reason it’s not considered to be a vitamin is that humans can make the necessary amounts (in healthy people) on their own, even without the help of food or supplements.


Its main functions are as a membrane stabilizer, antioxidant, and production of adenosine triphosphate in the oxidative respiration process.

ATP (adenosine triphosphate) molecules are available to supply energy to the numerous chemical reactions necessary for sustaining life.

Moreover, it enhances the power of vitamin C and vitamin E and stabilizes blood sugar levels in people with type 2 diabetes mellitus.

Health Benefits of CQ10

Hypertensionhypertension high blood pressure

A 2007 analysis of twelve studies on patients with hypertension, at Cardiac Surgical Research Unit, Melbourne, Australia, concluded that the substance lowered systolic blood pressure 11 to 17 points, and diastolic 8 to 10 points.

One reason may be due to this substance capability to dilate blood vessels (1).

Heart healthheart disease blood pressure

The heart consumes more energy in the form of adenosine triphosphate than almost any other part of the body.

A 2014 randomized double-blind trial concluded that supplementation with this antioxidant can restore deficient levels of this substance in people with moderate-to-severe heart failure (2).

Periodontal disease

Periodontal is a pathological inflammatory condition of the gum and bone support surrounding the teeth.

Healing and repair of periodontal tissues require energy production, which, as we have seen, requires sufficient amounts of this substance.

Prevents aging

This substance plays an essential role in mitochondrial ATP functions and synthesis as a powerful antioxidant in mitochondrial membranes.

In 2005, a study at the Institute of Nutrition and Food Technology, University of Granada, Spain, concluded that supplementation attenuates the age-related increase in DNA damage (3). However, further research is needed to understand its role in skin aging.


It stimulates the immune system, leading to greater numbers of macrophages and T cells (T lymphocytes). T cells are a specific type of white blood cells that mature in the thymus and stimulate the B cells to make antibodies, that help killer cells develop.

Cancer is the result and a significant cause of free-radical damage related to inflammation, therefore, this antioxidant may help prevent cancer from developing.

Mitochondrial dysfunction

Mitochondrial dysfunction has been associated with an array of degenerative illnesses, ranging from neurological disorders and diabetes to heart failure.

According to clinical studies, when a supplement with this substance was given for 6 months, it seemed to reduce the symptoms associated with mitochondrial encephalomyopathies (4).

Parkinson’s disease

This substance has been shown to slow down the progression of Parkinson’s disease, a neurodegenerative brain disorder that progresses slowly in most patients.

A 2002 study at the University of California published in the Archives of Neurology established that high doses (1200mg/day) appear to slow the progressive deterioration of function in early PD when compared to placebo (5).

However, based on the current evidence, official supplementation with antioxidants is not recommended.

MigrainesSeven Easy Lifestyle Changes To Prevent Stroke, Diabetes and Obesity

The 2016 study, conducted at Cincinnati Children’s Hospital Medical Center, established that children and teenagers who suffered from this condition are likely to have mild deficiencies in riboflavin (vitamin B2), vitamin D, and this substance (6).

Enhances exercise performance

In 2008, a study issued in the Journal of the International Society of Sports Nutrition determined that supplementation with this substance resulted in increased time to exhaustion and maximal oxygen consumption (7).

Plant-Based Food Sources

Our levels of this antioxidant naturally decline with age. This decline is most apparent in individuals over the age of 40.

Fortunately, you can replenish these levels by eating the right foods, such as – oils from sesame, soybean, and canola, sesame seeds, roasted peanuts, pistachio nuts, broccoli, cauliflower, oranges, spinach, or strawberries.

It’s estimated that the average person’s diet contributes around 25% of the total level of this substance.

What are the signs of deficiency?

Symptoms of deficiency include high blood pressure, heart failure, fatigue, chest pain, muscle weakness, and soreness.

Causes of deficiency

Individuals with certain conditions, including Parkinson’s disease, type 2 diabetes, and heart problems, tend to have low levels of this antioxidant.

Also, tobacco smoke can deplete body stores.

Furthermore, fatigue, stress, and aging can diminish the amount of the substance found in your body.

Statins and CoQ10

Cholesterol-lowering statin drugs (statins such as atorvastatin, cerivastatin, pravastatin lovastatin, and simvastatin) block the production in your body.

These drugs work to lower LDL cholesterol by inhibiting a liver enzyme called HMG Co-A reductase, which will ultimately lead to a reduction of the liver’s capability to make cholesterol. But that same mechanism that blocks LDL cholesterol also blocks the production of this antioxidant.

Currently, at least 1 in 4 American adults over the age of 40 is taking a statin drug to lower LDL cholesterol levels. Thus, if you’re on these drugs, it’s important to supplement with this powerful antioxidant.

Supplement dosage

There is no official daily value recommendation but a daily dosage of up to 90 to 120 mg was found to be tolerated by all persons (healthy or unhealthy). In addition, some studies have found high daily dosages safe, up to 3,600 mg per day.


This supplement is fat-soluble; therefore, it is best to ingest it with meals that contain at least a little bit of fat.

Side effects and precautions of Coenzyme Q10

No serious adverse effects have been reported from the use of this supplement. However, some individuals have experienced: insomnia, increased liver enzymes, rashes, loss of appetite, nausea, upper abdominal pain, itching, sensitivity to light, irritability, dizziness, headaches, heartburn, flu-like symptoms, and fatigue.

Additionally, it may interact with anticoagulant medications at high doses.

Pregnancy & Breastfeeding

A study demonstrated that supplementation with CoQ10 during pregnancy may prevent preeclampsia in at-risk women.

However, it is recommended that pregnant or nursing mothers and people with a known medical condition should consult a healthcare specialist before using this supplement.

Final Words

There’s no need to take the supplement, particularly if you are healthy. However, if you have high blood pressure, heart disease, mitochondrial dysfunction, or Parkinson’s disease, this supplement may be helpful.


Gallic Acid: Uses

Foods High in Quercetin

Hesperidin Side Effects

1 thought on “CQ10 Side Effects & Health Benefits”

  1. Since regular CoQ10 does not dissolve in water and dissolves poorly in fat, it is hard for our bodies to absorb it. Instead of worrying about taking CoQ10 with a fatty meal, you can take a CoQ10 supplement that is both water and fat-soluble to be sure your body is actually absorbing it. Research shows that solubilized formulations of CoQ10 are absorbed better by the body and lead to higher plasma CoQ10 levels. (Source: https://www.ncbi.nlm.nih.gov/pubmed/?term=Plasma+coenzyme+Q10+response+to+oral+ingestion+of+coenzyme+Q10+formulation)


Leave a Comment