Fever Tree Mediterranean Tonic Water is made using naturally sourced quinine from the bark of the fever tree in the Congo, blended with spring water, natural cane sugar and Tanzanian bitter orange, much like their Premium Indian Tonic Water. The Mediterranean Tonic adds the essential oils of Lemon Thyme and Rosemary from Provence to bring a more floral aroma which really compliments lighter gins. Importantly, no preservatives or artificial ingredients are ever used in any of Fever-Tree's products. If three quarters of your Gin & Tonic is tonic, then you should be using the best tonic. This is the attitude Fever-Tree brought to the craft of their original Indian Tonic Water and a standard they continue to apply across their range.