Using antioxidant-rich green tea as its base, this nourishing mélange comes packed with a host of flu-fighting natural wonders. A mix of echinacea, elderberries and rosehips, both loaded with the Vitamin C your body needs to repair and restore your immune system and goji berries. Goji is likewise thought to boost the immune system thanks to the presence of Vitamins A and C, iron and antioxidants.