Quote from: NorthState on January 13, 2013, 04:55 amAmphetamine sulphate is very stable, but some products have lots of other chemicals in it which can create all sorts of problems for it to stay intact.But in all cases storing to a dark, cool and dry place like freezer is the best option, but the product should be free of water (at least thats what i have understood ).I think the formation of ice crystals can destroy some of the molecules on occasion. I mean I'm picturing a water with amphetamine sulfate floating around in there freezing, and water expands, which means it's going to put some small crushing pressure on some of the amphetamine sulfate -- which could translate to some of the molecules breaking apart. I mean I doubt it would be many, but I suppose it would happen to some extent. Naturally an actual chemist can correct me if I'm mistaken.Honestly, I don't think that if the speed is pure, you need to worry about freezing it. Just keep it at 60ish (15C) degrees or so. You know, cool room temperature and out of sunlight. But do whatever. Unless you're planning on storing it for a year I don't think it makes much difference.