I've found the yellow borneo does nothing for me. My personal faves are green kasung, green maeng da, white elephant and red thai. Just have to make sure you drink plenty of water after dosing. I take mine in an iced coffee. I was hooked on cocodamol before I jumped to kratom so my tolerance was already high. My sweet spot is 7.5g but I'm able to drop it down sometimes by using potentiators