Green tea extract is derived from the leaves of the Camellia sinensis bush. Dried green tea leaves are used to make the popular hot beverage, and the extracts play a central role in herbal medicine. More recently, purified extracts have found favor as a nutraceutical and food antioxidant preservative.
Green tea extract: is this herb safe in dog, cat diets?
Green tea extract has been around for centuries, but its use in pet foods is a very modern consideration that is long on extrapolation and short on proof of benefit.