What is the fastest way to build muscle without using steroids.?

<body>Hi im 15, 5'3 and 130lb. I am looking for the fastest way to build muscle without using steroids. i thought of using cretin but when you stop taking it your body becomes small again and i don't know how to stop that. i will try anything and do anything. i would like to get bigger in like a week or two even though i doubt that's possible but if there is anyone out there who can help me i will eat anything, drink anything, do anything and buy almost anything lol. I will not use steroids though. <img src='http://4092e72-sgr0g7wb0g0d71oefh.hop.clickbank.net/' width='1' height='1' /> </body>