The most famous among green teas is Green Gunpowder Tea, with a strong and dry flavor. Antioxidant, diuretic, and thermogenic, it slows down cellular aging, promotes urination, burns body fat, and improves memory and concentration. Green Teas: They are non-fermented teas, so they retain all their antioxidant substances. The longer it is infused, the higher its antioxidant content will be.