Active compounds in Medicinal plants

Plants produce many chemicals that are biologically active not just in themselves but also in other organisms. Some of these chemicals enhance their own survival. Some plants produce chemicals that act as herbicides to inhibit the growth of competing plants such as the salicylic acid produced by willows. Other plants produce substances that deter browsing by insects and herbivores. Below are several examples of active plant ingredients that provide medicinal plant uses for humans.