Have used it up to 6ius per day with great results but now use Chinese blues for half the price...with the same results. Some people swear by them,(Jins)some people can't tell them apart from any other HGH...I've also used Humetrope,Protropin,Serostim&Hygetropin and the blues give me the same effects...I guess its whatever you like...Like "test is test"...I feel the same about GH....if its real HGH, then brands shouldn't really matter