Twinings Invigorating Peppermint. Fields of soft green peppermint leaves sway with the breeze. Each year we wait for the warmest months to come before we harvest when the leaves are rich in essential oils. It's what makes this infusion taste so minty and invigorating. For centuries peppermint has been used to aid digestion, making it perfect just after a meal. Made with all-natural ingredients nothing more, nothing less. Naturally caffeine free with no added sugar.