The short answer is: some are and some aren't. For full nutritional info including sugar content, please take a look at your nutritional label on the bottle. Here's the long answer... Fruit Drops flavor collection are all-natural, unsweetened flavor essences. Waters flavors are sweetened with fructose, sugar and/or stevia leaf extract. Fountain Style flavors are sweetened with sugar, sucralose, acesulfame potassium and/or stevia leaf extract. Diet/Zero flavors are sweetened with combinations of sucralose and/or stevia leaf extract and/or erythritol.