The Perfect Herbal Tea to Be Enjoyed Anytime While grape leaves are believed to have originated from Persia, they have been available to us in abundance for centuries. All of our organic herbal grape leaf tisanes have no caffeine and the glycemic index is nearly zero, allowing even diabetics to enjoy them. For a complete description of the ones available for purchase please open the description tab. Organic Ingredients: Grape Leaf Cool Mint: grape leaves, grape root, green rooibos peppermint leaves, Moroccan mint leaves, stevia leaf,