Creatine Monohydrate

• The most common form of creatine, creatine monohydrate comes in two different forms: standard form and micronized form. Although the micronized version is more water-soluble than the standard version, the standard version is still more widely available. However, the standard monohydrate has been known to cause stomach problems, as it has a lower absorption rate.
  
  

Creatine Phosphate

• One of the most expensive forms of creatine, creatine phosphate is created by joining a phosphate with creatine molecules. The biggest downside of creatine phosphate is the quantity of creatine that can be combined with phosphate; this mixture contains only two-thirds creatine, which is why it is considered less effective than other creatines.
  
  

Creatine Citrate

• Created by mixing citrate molecules with creatine, this form is gaining in popularity because it is very highly water-soluble. Although it is not as effective as creatine monohydrate due to the fact that it contains only 40 percent creatine, it is still widely used, despite its high cost.
  
  

Creatine Malate

• When creatine is combined with malic acid, creatine malate is formed. This form of creatine is also highly water-soluble, and the malic acid aids in rapid absorption. However, creatine malate remains the least common form of creatine, although studies are still being done to determine its level of effectiveness in relation to other forms of creatine.
  
  

Creatine Ethyl Ester

• Creatine ethyl ester is created by joining ester molecules to creatine. It is thought that by doing this, the creatine can more easily penetrate the cell membranes and thus enable it to be more effective. Although not as popular as creatine monohydrate, this form of creatine may be the next one to gain popularity in the near future.