Tonic water differs from other types of water because it contains sugar or high-fructose corn syrup. It also has citric acid, quinine, sodium benzoate, and natural flavors. Quinine imparts a bitter flavor while sodium benzoate acts as a preservative. The former additive may interact with some medications such as statins, antacids, and blood thinners. For people looking to reduce sugar intake, club soda and other sparkling waters are better than tonic water.

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