Generally, creatine monohydrate is the most researched and popular form of creatine, and there's evidence that it can be more easily absorbed by your body. It's also the standard form of creatine and the golden standard for creatine supplementation. Still, other forms, like creatine magnesium chelate and creatine HCL claim to have the same level of absorption. And while supplements that use these ingredients may be just as effective, you may want to consider that there is little research to back up these claims.