Bitter Gourd Internal Cooling and Cleasing 100% Natural Caffeine Free Herbal Tea - 20 Tea Bags (1.4 Oz) Manufacturer: Royal King Bitter gourd being rich in all the essential vitamins and minerals, especially vitamin A, B1, B2, C and Iron, its regular use prevents many complications such as hypertension, eye complications, neuritis and defective metabolism of carbohydrates. It increases body's resistance against infection.