Psychedelic drugs have been capturing the attention of doctors and patients alike, for their increasingly proven potential to effect long-lasting improvements in the mental health of people who are suffering from conditions such as treatment-resistant depression. Micro-dosing of psychedelic substances such as LSD or psilocybin involves taking a fraction of a regular dose (a subperceptual dose) that is much lower than one would take if one wanted to "trip" or hallucinate on these substances.