Green onions, like all onions, help in lowering blood sugar, high cholesterol and blood pressure, the risk of colon and other cancers, and inflammation. Quercetin, the most famous antioxidant found in all onions, offers anti-inflammatory and anti-histamine benefits. The essential trace mineral chromium packed into green onions can regulate glucose levels. And it's a rich source of vitamin C, fiber, manganese, vitamin B6, potassium, and copper, all integral to our overall health and wellbeing.