Microdosing is the act of consuming sub-perceptual amounts of psychedelics, most commonly LSD or psilocybin mushrooms, but also (in some cases legal) substitutes like psilocybin truffles or 1P-LSD.
Sub-perceptual means the effects are subtle but can have a noticeable influence on your life.
Typically, individuals integrate sub-perceptual doses into their weekly routine. Microdosers often report higher levels of creativity, more energy, increased focus, and improved relational skills. Many people microdose in order to treat depression or anxiety, with often remarkable results.
Some enthusiasts also report microdosing helps to heighten spiritual awareness and enhance all five senses.