Product Content Resveratrol for every 10 ml: 100 mg Quercetin: 25 mg Grape Seed Extract: 50 mg High Purity Active Ingredients Resveratrol - is supplied by Veri-te, a Swiss registered and patented trans-Resveratrol brand. Quercetin is obtained from the Sophorae japonica plant in 95% purity. Grape Seed Extract - is the extract obtained from natural grape seeds and is 96% pure. How to Use Vitisfera Resveratrol Syrup should be used as 10 ml (full scale) for those aged 11 and over, after meals, unless otherwise recommended by the physician. During infection, the above mentioned scales should be used 2 times, in the morning and in the evening.