Green tea contains a catechin called epigallocatechin-3-gallate (EGCG). Catechins are natural antioxidants that help prevent cell damage and provide other benefits. These substances can reduce the formation of free radicals in the body, protecting cells and molecules from damage.

Drinking green tea in moderate amounts (about 8 cups daily) is likely safe for most people. Green tea extract is possibly safe when taken for up to 2 years or when used as a mouthwash, short-term. Drinking more than 8 cups of green tea daily is possibly unsafe.

Studies suggest that the best time to drink green tea is in the morning and before the workout session. Swapping your cup of coffee with green tea is the best way to kick start your day. Like coffee, green tea also contains some amount of caffeine and L-theanine.