Fasting for a blood test typically involves abstaining from food and sometimes drinks for a certain period of time before the test. This is important because eating or drinking can affect the Glutathione Index Blood Plasma Quality Control by Plasma Glutathione Status Which blood tests can be done without fasting? HealthcareOnTime What is Glutathione? What are the Benefits of Glutathione? Glutathione Index Test Measure Antioxidant Levels At Home Fatty Acid Labs