Reactions may include nausea, vomiting, stomach upset, heartburn, diarrhea, loss of appetite, skin itching, rash, insomnia, headache, dizziness, irritability, increased light sensitivity of the eyes, fatigue, or flu-like symptoms.
CoQ10 may lower blood sugar
levels. Caution is advised in patients with diabetes or hypoglycemia, and
in those taking drugs, herbs, or supplements that affect blood sugar.