There are five main categories of creatine. These are creatine monohydrate, creatine citrate, creatine phosphate and creatine malate.

1. Creatine Monohydrate: Probably the most common form compared to the other products. Creatine is mixed with water to produce creatine monohydrate. It does cause bloating and it's effects are not statistically significant in the research. It was also found not to penetrate into the muscle cells effectively.

2. Creatine Citrate: Defaultis is also a popular form of creatine. This form dissolves rapidly in water and is combined with citric acid. This combination is supposed to produce greater muscle energy but has not been statistically supported. Some disadvantages include there is less concentration of creatine in this form compared to monohydrate and it is much more costly than creatine monohydrate.