Berberin is a so-called alkaloid. Alkaloids are found in plants and protect them from microorganisms, pests and predators, among other things, and also regulate their growth. Berberin is found, for example, in barberry , which gave the alkaloid its name. In the past, berberine was also used for dyeing because of its yellow colour. But berberin offers a lot more, the substance also seems to have a number of positive effects in the human body. Berberine is said to have antibacterial, antiviral, fungicidal, antioxidant, anti-inflammatory, immunomodulating, antidiabetic and even cancer-preventive effects.