The correct level of protein intake is key to reaching goals. If there is a lack of protein the body will draw what it needs from muscle mass reducing their size. However, if there is an excess the body will store it as fat or process it and it will leave the body as urine.
At ASN we recommend that you should base your daily protein intake on 2g per kg of body weight for muscle building and 1-1.5g per kg of body weight for other indurance sports.