Don't know if I am allowed to post company names on here but the website I found, looks like his CP is manufactured by a company called Toku-e. It is a Japanese company that has moved to the states and to Belgium. They do state that all their meds are for in vitro research only and not for human or animal consumption. Not sure if using this in a Qt tank is violating those rules but the company looks legit. Maybe someone with more knowledge than me can check it out and see if there is a problem with using this in QT.
Do they have an MSDS or a certificate of analysis. I would be more concerned about any impurities and or the purity they provide it at so you could dose it correctly and account for anything less than 99% purity.