Researchers are rediscovering psychedelic compounds from traditional plants and fungi as potential treatments for mental health conditions and addiction. These substances work by interacting with brain chemistry, particularly serotonin systems, to reduce symptoms of depression, anxiety, and drug cravings. Recent clinical studies show promising results, especially for treating opioid addiction with single doses that can produce lasting improvements. However, more rigorous clinical trials are needed to fully understand how these compounds work and to establish safe, effective therapeutic protocols.