Arginine HCL (arginine hydrochloride) is a synthetic form of the amino acid., Combines arginine and a molecule of hydrogen chloride. On the market it can be found in all forms: powder, pills or capsules. Arginine HCL is cheap to produce and therefore willingly used by manufacturers of supplements. Use it often athletes to increase the supply of oxygen and blood flow during increased effort. Hydrogen chloride was combined with arginine to accelerate and increase its absorption. Unfortunately arginine in this form today short, usually only an hour or two. Then it excreted from the body. Safer and more dziłąjącą formną is natural L-arginine. Unfortunately it is also much more expensive.