Flavor with other natural flavor. 10 calories per serving. 90% fewer calories than leading beverages. Say yes to delicious! Crystal Light lets you have it all! Thirst-quenching flavor for your water and just 10 little calories per serving. This product 10 calories. Leading beverages 150 calories. Caffeine free. Low sodium. Gluten free. CrystalLight.com. Carton made from 100% recycled paperboard minimum 35% post-consumer content.