Fasting for blood work typically involves avoiding food and drink (except water) for eight to twelve hours to ensure accurate results, particularly for tests like glucose, cholesterol, and triglycerides. It is important Which Blood Tests Require Fasting And For How Long? HealthcareOnTime Total Glutathione Quest Find Lab Tests Online Glutathione Index Test Food for the Brain Foundation A study shows that the antioxidant glutathione feeds cancer cells Rapid and effective protocol to measure glutathione peroxidase activity Bulletin of the National Research Centre Springer Nature Link