Green Tea Extract’s primary benefit is as an antioxidant—and it is one of the most potent antioxidants, helping protect your skin against environmental pollutants. Flavonoids also appear to boost immune response in skin cells, making skin better able to defend itself against external toxins. Research also shows that the catechins in Green Tea Extract act as a sunblock and as a way to reduce signs of aging in sun-damaged skin. Finally, Green Tea Extract is an anti-inflammatory agent, so it will soothe your skin and prevent redness.