I have previously ordered Piracetam, choline bitartrate, and Oxiracetam from CH. I was quite satisfied with the site and the service.
It was about 2 or 3 months ago, and the Oxi and Choline came in within 5 days. The Piracetam was back-ordered but still came in within two weeks. I am also in the US and quite close to their location, so I don't know if that contributed to the experience.
However, I do not have the knowledge or tools to test for purities. The only thing I can say is that the substances are as white as they could possibly be, and they all taste how I have heard they are supposed to taste.
I just want to know, before I buy more from them, if any real concerns have been raised about the purity of the substances. So far, I have not seen any reputable members of this site complain, but I just want to be sure; i don't want heavy metal poisoning.