I wouldn't touch the stuff - it can lead to tight and heavy muscles. Exactly what you don't want if you're a boxer.

Here's what's been recommended by some gym monster probably working for some supplement company.

"The first way is called loading. This method works very well for anyone who has never taken creatine before. Just as the name implies, it involves loading up or saturating your muscles with creatine. During the first four days to a week, take 20 to 30 grams per day. Mix it with non-acidic juice or water. Grape juice works well. After this loading period, take a regular intake of between five to fifteen grams per day to keep your muscles saturated (no need to over do it). The other method is a more gradual approach to supplementing with creatine monohydrate. Over the course of an extended period, one basically skips the loading phase and just supplements with five to fifteen grams per day, everyday. The best results have been noticed when creatine is combined with a high carbohydrate base, such as dextrose (glucose) and taken about one-half hour before training."

Don't come bleeting when you get muscle cramps and a dose of the scats.