Does microdosing build tolerance? What I've noticed after 8 months

The pharmacology: psilocybin tolerance via 5-HT2A receptor downregulation is well-established. After repeated activation, receptors reduce in density and sensitivity. This is why you can't use full psilocybin doses two days in a row and get equivalent effects. The question for microdosing is whether the much smaller doses used (0.05-0.15g) produce enough receptor activation to downregulate — and over what timescale.

My n=1 data across 8 months: Months 1-2: very clear dose days vs. rest days. Consistent effects. Months 3-4: effects become more subtle. Still present but less salient. Months 5-6: I increased dose slightly (from 0.10g to 0.13g) and effects returned. Months 7-8: started a break month. After the break, 0.10g was again clearly perceptible. Interpretation: something like tolerance is building over time, and breaks restore sensitivity.

The Stamets protocol (5 days on, 2 days off) is specifically designed to avoid this. The longer rest periods are intended to prevent cumulative receptor downregulation. Some people find Fadiman (1:2) works better early in a protocol; switching to Stamets after several months may reduce tolerance accumulation.

Recommended practice: schedule a full month off every 3-4 months of microdosing. The break allows receptor sensitivity to normalize, clarifies what was and wasn't from the microdose (placebo check), and prevents the kind of psychological dependence where you feel 'off' without it. I treated the break month as part of the protocol, not an interruption of it.