I bought this letrozole from americanresearchchemicals. I did not notice that it was damaged in anyway upon arrival but I later noticed that there is a white substance at the bottom of the bottle, (I tried to capture this in the Picture) which made me wonder if the substance was not sufficiently mixed or if there was something wrong with it. Do you guys now what this is, like is it just some cheap fake letro or is it something wrong with it?