Harmine Products | Cleanchem - Harmine is an alkaloid that acts as a monoamine oxidase inhibitor (MAOI), primarily used in traditional medicine and as a research compound. It has been studied for its psychoactive effects and potential use in treating mental health disorders like depression and anxiety. Harmine is also known for its presence in plants like the Banisteriopsis caapi, which is used in the preparation of ayahuasca.