Anecdotally in the past I have felt major differences in my mood right after and over the next few months since after taking mushrooms containing psilocybin (liberty caps locally picked growing in nature).
The quantity was anything but microdoses though. Each time I had them the amount ranged from 6x to 10x individual dried caps (over a period of 4-5 hours each time).
I'm not sure about its impact on my creativity though, but it sure did not impact negatively.
Since it wasn't clear; I noticed a clear positive impact on my mood but did not notice any measurable positive gains in creativity (nor any negative impacts).
The quantity was anything but microdoses though. Each time I had them the amount ranged from 6x to 10x individual dried caps (over a period of 4-5 hours each time).
I'm not sure about its impact on my creativity though, but it sure did not impact negatively.