There are two main types of nootropics: natural and synthetic. Natural nootropics include substances such as caffeine, ginkgo biloba, and omega-3 fatty acids, which are found in foods and supplements. Synthetic nootropics are created in laboratories and include drugs like modafinil and racetams.
While natural nootropics are generally considered safe and well-tolerated, synthetic nootropics have not been studied as extensively, and their long-term effects are largely unknown. It is important to be cautious when using any type of nootropic, and to consult with a healthcare professional before starting a new regimen.