"Your body produces creatine, and for the average person, there is enough. However, studies have shown that some athletes do benefit from creatine supplements, either by taking a supplement of creatine monohydrate, or by eating more meat. Meat, fish and poultry contain excellent supplies of creatine.
According to the experts at Tuft's, it isn't the creatine that builds the muscle or makes you faster, it just allows the body to work harder to do so. It seems that even the ancient Greek athletes unknowingly took advantage of creatine supplementation by increasing meat in their diet prior to competition.
According to a report published in the monthly newsletter 'Environmental Nutrition,' studies show that taking 20 grams of creatine monohydrate for five days, followed by a maintenance dose of two to five grams per day can bulk up muscle and improve performance. However, it is important to note here that different sources recommend different rates of supplementation.
Muscles can store creatine, so more is not necessarily better because excess will be excreted in your urine. That can mean money down the toilet if your muscles are already loaded. It may be more economical to get your creatine from a diet that contains low fat meat and poultry as those foods supply other important nutrients that an athlete needs such a protein and iron. "
- Taken from
http://www.parentsplace.com/expert/nutritionist/qas/0,,240104_111551,00.html