Creatine HCL works well because adding the hydrochloride group to the creatine molecule lowers the pH of the creatine, making it more acidic. This drastically increases its solubility in fluids. You'll notice this when you mix creatine HCL in water; it mixes almost instantly with no sedimentation, with no particles sitting in the bottom of the glass. Any ingredients that have precipitated to the bottom of a cup are ingredients that will sit in your intestines and not be absorbed properly. This will also cause water to be pulled into the intestines, causing stomach discomfort and diarrhea. Creatine HCL has been shown in the lab to be about 40 times more soluble in fluid than creatine monohydrate.
And research shows that when subjects consume the same amounts of creatine HCL and creatine monohydrate, the creatine HCL is absorbed by the intestines around 60% better than creatine monohydrate. This means that you can take a much smaller dose of creatine HCL to get similar results as creatine monohydrate. With greater solubility in fluid, greater absorption by the intestines and with a much smaller dose, you significantly reduce the chance of stomach issues and subcutaneous water retention.

Creatine HCL is a colorless, crystalline substance used in muscle tissue for the production of phosphocreatine. Creatine is an important factor in the formation of adenosine triphosphate triphosphate(ATP), the source of energy for muscle contraction and many other functions in the body.

Creatine HCL are sometimes used by athletes, bodybuilders, wrestlers and others who wish to gain muscle mass, typically consuming 2 to 3 times the amount that could be obtained from a very-high-protein diet.