Soda flavored syrups contain sugar (sucrose), not high fructose corn syrup (HFCS). We have chosen to formulate without high fructose corn syrup. The exception to this is Energy Drink, which indeed does contain fructose and dextrose, in addition to sucrose. In addition to sugar (sucrose), regular syrup flavors contain sucralose (Splenda® brand) and some also contain acesulfame potassium. If you have dietary concerns, please read the label of every SodaStream eco friendly product before purchasing.