Fever-Tree Lemon Tonic combines the bright aroma and taste of freshly squeezed lemon essential oils, extracted by a ‘Sfumatrice-Torchio’ method (typically reserved only for use among fine perfumeries) with the finest quinine from the Democratic Republic of the Congo for a sharp, but balanced citrus taste. Gluten Free. Non-GMO certified. Naturally sourced ingredients, no artificial sweeteners.