He was “microdosing” , taking a small fraction of the dosage that would get you high, in an effort to increase his creativity.
https://www.scientificamerican.com/article/do-microdoses-of-lsd-change-your-mind/
I believe it is true that “microdosing” won’t get you high. I have no idea whether it is effective at anything. Maybe there is a therapeutic use worth investigating in a scientific manner for things like anxiety, PTSD, trauma etc.
I had a friend who microdosed on Psilocybin mushrooms in Vegas. Except he “microdosed” every 4 minutes. Didn’t work.
Or maybe it did. :-)
Doing the Timothy Leary thing.
Microdots are hits of acid (LSD) on paper. They were even putting it on the envelopes sent to prisoners.
They were everywhere in the early 70’s.