Safety and side effects

Coenzyme Q10, also called, CoQ10 supplements seem to be safe. They cause few side effects when taken as directed.

Mild side effects might include stomach problems such as:

• Upper stomach pain.
• Loss of appetite.
• Nausea.
• Diarrhea.

Other possible side effects may include:

• Dizziness.
• Problems sleeping.
• Tiredness.
• Headaches.
• Rash.
• Irritability.

Healthcare professionals haven't decided if CoQ10 is safe to take during pregnancy or while breastfeeding. Don't use CoQ10 if you're pregnant or breastfeeding without your healthcare professional's approval.