LSD microdosing: a randomized, blind self-experiment 13 years ago
Throwaway here, for obvious reasons.
I'm aware of a double-digit participant, single-blind, randomized study of microdosing LSD. ~30 individuals. There are gaps in the survey results, but the whole thing was...intriguing.
No one is willing to take the risk of publishing, even anonymously. I won't insult your intelligence by discussing the results of such a chimera. I post only to lament the loss of scholarly freedom in our age.