I have found:
5-10mg: good for a light psychedelic buzz. I take this dose for concerts often. It can be a bit uncomfortable coming up in a crowd but once past that, it makes practically any concert awesome. Might want some caffiene though, 4-aco-dmt can make me a bit sleepy.
15-20mg: usually a solid medium-strength trip. The first time I took this drug I took 20mg, and that was very very strong mentally. TR
Since that trip I have never had strong mental effects on 4-aco-dmt
25+mg: usually quite strong, 27mg left me unable to move for about an hour, the visuals were ridiculous
I have taken 30mgs and i got very minor, if not, no visuals what so ever. Made me wonder about my product. 20mgs gave me walls moving and such but still nothing amazing. Going to try 25 right now again. See what happens.