Natural flavor with other natural flavor. Sugar free. 90% fewer calories than leading beverages. 5 calories per 2/5 packet. Just add to 20 fl oz of water. Makes 2.5 servings. Contact Us at: 1-866-572-3807. 99% caffeine free, 10 mg caffeine per serving. This product 5 calories; leading beverages 70 calories. Gluten free.