Native to Chile on the west coast of South America, Black Chilean guavas only measure about 2 centimeters in diameter and they boast a sweet flavor that is said to have notes of strawberries and cotton candy. Nutrition-wise, these fruits contain high amounts of antioxidants and moderate amounts of vitamins C and K. Chilean guavas are also a good source of fiber and carbohydrates, which in turn break down into glucose that our body's cells use for energy.