i bought 5.3 mg and i have been told to take 23 cc which is about 4 i.u, i have 5 boxes of 5.3 mg Genotropin (Sweden), i have finished the first one, and now am using the second box, yet, when i diluted it with its solvent, appearantly, bubbles formed, with some poweder still undissolved, so i tried to dissolve this poweder by just moving the bottle slowlly, it helped a little, however, still some bubbles were left. the person the bought this from is out of town, and am waiting for him to come back and discuss this with him, am also using BONAVAR (Thailand), Winny (Spain)