Crystal Light On-the-Go Metabolism Plus Green Tea Peach Mango is sugar free. Green Tea contains powerful antioxidants plus caffeine to help boost your metabolism. With only 5 Calories per serving, Peach Mango Green Tea has 90% fewer calories than most of the leading beverages which have 70 Calories. Non-carbonated & packed with caffeine, Crystal Light Metabolism can be poured into bottled water to keep you energized all day long.