Read page 3 of this study. It's highly underrated as I've never seen it referenced before but it has what is IMO some of the most important details on DNP in it.
The graphs are hard to see properly because it looks like it was photographed manually, but you'll get the gist of it. it shows that people can have wildy different peak/trough responses to the same DNP dose even on a day-to-day basis. The chart on the left shows 4 people (because 2 of the curves are the same person), and how quickly they peaked/troughed from 3mg/kg.
for e.g, in the person who was tested twice under the same conditions (curves 2 and 5), curve 5 showed their peak metabolism on that day was reached after 2 hours, whereas in curve 2 on a seperate day without accumulated dosing, it was still increasing at the end of 6 hours instead of peaking at 2 hours. Both were on the same person, with the same amount of DNP (3mg/kg). Same pre-conditions before each dose as well - 15hr fasting.
Added to the unpredictability day to day, is the fact that the threshold for intolerability can be very close to the tolerable one - i.e 200mg has me barely feeling it, but 400mg will have me experiencing intense nightsweats and fatigue to the point I can't function.
If you can handle 750mg it's highly likely it was underdosed so becareful. It might mislead you when taking another vendor's DNP, thinking it's equal dosed, but it could = hospital time at 750mg.
@Trenbolonetax you may be interested in this.