CoQ10, also known as coenzyme Q10 or ubiquinone, is a non-vitamin nutrient that is consumed in the diet and synthesized in the body. CoQ10 acts as an antioxidant in cell membranes. It plays a role in the production of energy within the body's cells; in the renewal of skin; and in the reduction of free radicals that cause oxidative damage. CoQ10 is thought to help prevent heart disease, breast cancer, high blood pressure and other chronic conditions. While taking CoQ10 may provide you with numerous healthful benefits, it may also result in negative side effects.
Gastrointestinal Distress
Nausea, vomiting, diarrhea and heartburn are the most common side effects of consuming CoQ10 as a dietary supplement. As a result of stomach upset, you may experience a loss of appetite. To avoid such complications, you may benefit from taking smaller doses of CoQ10 throughout the day rather than one large dose. Taking CoQ10 with food during meals will aid your digestion and decrease stomach upset. These unwarranted reactions are typically mild and do not require treatment.
Allergic Reactions
Some individuals experience an allergic reaction to CoQ10. Symptoms of an allergic reaction include irritation, itching and a rash. Other symptoms include hives, swelling of the throat, difficulty breathing and tightness of the chest. These are more serious side effects and may require medical treatment. Consult your physician if you are concerned about an allergic reaction.
Insomnia
Taking excessive amounts of CoQ10 may affect your ability to fall asleep or stay asleep. This is likely the result of the energy produced by CoQ10. If you suffer from insomnia while taking a CoQ10 supplement, avoid using it before bed. It is best to take this supplement in the morning rather than at night.
Low Blood Pressure
CoQ10 is known for its ability to lower blood pressure. While this is desirable for most people, it can cause adverse reactions for individuals with a low blood pressure condition or for those taking prescription medications to treat high blood pressure. CoQ10 can also increase the effects of blood pressure medications. Therefore, it is important to consult your physician before beginning a CoQ10 supplements. Low blood pressure can result in headaches or feelings of faintness. You may need to divide your daily dose into smaller amounts and take it throughout the day.
Low Blood Sugar
CoQ10 is beneficial in lowering blood sugar levels. For this reason, individuals with diabetes or hypoglycemia, a low blood sugar condition, need to closely monitor their glucose levels. It is important to notify your physician and take proper precautions when you use a CoQ10 supplement.
Elevated Liver Enzymes
Elevated liver enzymes may be a problem for individuals with liver disease or for those taking medications that impact the liver. If you suffer from liver conditions, you should exercise extreme caution when taking CoQ10. Consult a physician before you begin a CoQ10 supplement regimen.
Other Potential Side Effects
Other mild symptoms are associated with CoQ10, including headaches, irritability, increased sensitivity to light and flu-like symptoms such as aching, fever, fatigue, a cough and a stuffy nose. Everyone has a different threshold for supplements and medications. You may or may not experience these side effects when taking CoQ10.
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