Not claiming to be an expert on weed all over the world but i'm in the uk and have only once got any weed here that comes close to the stuff in amsterdam! I think on the whole most people who have been to the dam would agree it's a lot better than anything they've had before. Not sure what you mean by "the stuff they add into it" Are you talking bout shit to make it heavier? Coz i don't believe i've ever been passed anything like that in the dam, but i guess i wouldn't necesserily know. Or did you mean chemical fertilizers? To be honest i really couldn't give a shit about that, they're only adding it to get more potent and bigger buds, thats a good thing ain't it?