Due to its good tolerability compared to most other caffeine-containing substances, the binding of caffeine contained in guarana to ballast substances is essential. Due to this peculiarity, which also exists in the well-known green tea, caffeine is ingested during the digestive process in the intestines, instead of - as in coffee - in the stomach. In addition, the richness of ballast substances (indigestible plant fibers), fats and proteins ensures better digestibility. Therefore, people with sensitive stomachs are very rarely intolerant of guarana.