I literally know someone who took a gram (1,00mg) of the stuff at once. They should have gone to the hospital, though they managed to recover from it on their own. But I remember them looking so down for at least a week, if not two, after doing that. Also, they weighed about 210 I'd estimate. If you have low/no tolerance, that has the potential to cause a lot of bad things. I'm late to this thread, so this information is mostly for people who come upon it. Please let us know you're okay.