Update: After doing a range of doses from 300-1000mg (split into 2) for one week and feeling little to no effect, I took a single large 1500mg dose and the Effects were profound.
I've been peating for nearly 2 yrs now. Started off great, got even better, then hit a horrible phase of fatigue and anhedonia. I think maybe the increased sugar depleted my thiamine. Even had weird neuropathy symptoms at some points. Hopefully this works, I'll keep updating this thread for any future observers.
P.S. The reason I took this large dose is due to Costantini et al. (2013) who had some "non-responder" participants who didn't budge until 1500-1800mg/day (free PMC: https://pubmed.ncbi.nlm.nih.gov/23696141/). "Patient numbers 2 and 3 never reported any improvement until the dose was increased up to 1500 mg/day, orally. An abrupt improvement instead occurred at doses of 1800 mg/day." The paper doesn't detail whether this was a split dose or not.