Tetley Green Tea now with an extra punch! Tetley Green Tea is undoubtedly an excellent source of antioxidants. All the goodness now comes with an extra punch of added Vitamin C with the new Tetley Green Tea Immune Range. While antioxidants help cleanse your body from within Vitamin C helps support your bodyâs immune system. Each cup provides 10% of your daily requirement of Vitamin C. Enjoy this great tasting cup of Green Tea with memorable Tulsi flavour that ensures rejuvenation in every sip. #A cup of green tea contains as much as 5 times (5x) the antioxidants as an apple. (âUSDA Database for the Flavonoid Content of Selected Foodsâ Rel 3.3 March 2018).