This is a stacked bar chart that shows the number of completed clinical trials per year that study psilocybin, or MDMA, or LSD. Shown are the years 2012 through 2022. In 2012 and 2013 only one study (MDMA) each year was completed. In 2014 and 2015 3 studies each year were completed. The number continues to increase most years and in 2022 six studies have been completed (3 MDMA, 3 psilocybin).