Natural alkaloids are organic compounds that primarily occur in plants and are known for their pharmacological effects. They often contain basic nitrogen atoms and can have significant impacts on human health, acting as stimulants, sedatives, or pain relievers. Common examples include morphine from the opium poppy and caffeine found in coffee beans. These compounds play essential roles in plant defense, deterring herbivores and attracting pollinators. Natural alkaloids are also important in traditional medicine and modern pharmaceuticals, contributing to the development of various drugs used to treat a range of conditions, from pain management to mental health disorders.