I would start with prly like 2-3 grams to see how you react to it. If you have ever done any painkillers like vicodin,percocet,morphine etc. then you might need a couple more grams. If you start out with to much you will be sick, so take it slow and wait an hour before you take anymore. Try to take it on an empty stomach bc it works better. I use the red vein borneo and I have been using kratom for 3 years and I take usually 7-9 grams at a time. The red vein borneo I think is the best bang for you buck at bouncing bear. I get a high similar to taking a few vicodin with the red vein, and with the green vein it feels like a few tramadol. Good luck. Peace