As someone with ADHD, the results of this study are encouraging, but limited. They summed it up well in the article, but the study only covered people who were self-microdosing and then self-reporting, which leaves lots of uncontrolled variables.

“This study is a naturalistic prospective study, meaning that we measured participants over time without manipulating any variables such as substances and doses they used for microdosing during the study,” Haijen said. “In contrast to a controlled lab-based study, where drug- and dose uniformity is guaranteed. Also no control group was included, so we cannot say if this effect was purely because of microdosing, or if other factors, such as placebo- or expectancy effects, were the main force behind the changes we observed. So this study should be seen as a first step in this research direction, as more and controlled studies will hopefully follow.”