Kratom is very touchy IME. Start low and work your way up till you find your optimal dose. Use a scale and take note. A standard deviation of just +-.2g can mean the difference between not feeling it and getting sick.

Take note that if you consistently use kratom that our standard dose will start to increase.

I worked my way up from 2.5g to 3.6 over the course of maybe 2 months then quit for 2-3 months. Coming back I didn't think about it and took 3.6g and it was horrible.

Diet plays a huge roll in how much one needs. for a period that I went raw vegan I had to decrease my kratom dose to 2/3 or less of what it was previous to that.

Note that 2.5-3.6g is generally a low dose for most people but my diet is very clean (still dirtier than raw vegan at this point though).