Unless something recent came out that I missed the few studies on micro dosing suggest it’s no better than placebo. Which isn’t to say it’s not effective, we do need more studies here.
Macrodoses of about 20-30mg (which is between 1g and 3g of mushrooms depending on potency), in clinical settings, have shown very strong evidence in the treatment of treatment resistant depression and end of life anxiety, and good evidence in treatment of anxiety disorders as well as alcohol and tobacco addiction.
Personally, I like 10-20mg once or twice a week for habit change*, and larger doses for getting out in the woods by myself and just being. I guess you could call it ego dissolution but I’ve done it enough times that when I’m in the right headspace it doesn’t feel like I’m losing anything but becoming part of everything. Listening to the birds and insects, it’s easy for me to completely forget myself on tryptamines like psilocybin and DMT.