We are studying the potential relationship between microdosing, cognitive performance and mental health. ‘Microdosing’ is the practice of taking psychedelic substances (e.g. psilocybin or LSD) in small, sub-perceptual amounts on a regular basis. There are many microdosing reports online, on blogs, and in books, but there are few research studies. The effects of microdosing on cognitive performance and mental health remains largely unexplored. Through this study, we are gathering data from both microdosing and non-microdosing groups.