The semi-essential amino acid L-arginine is known for its nitric oxide-forming function in the blood. This effect leads to the well-known and highly valued "pump" effect among strength athletes, through which your muscles appear wonderfully full during training and your blood circulation is improved. This ultimately leads to a reduced risk of injury and an increased muscle awareness. Precisely because of this and some other benefits that L-arginine HCL brings, this active ingredient is also found in pre-workout products like our Pump Fuel. • Hydrochloride (HCL) compound for high bioavailability • Without additives & extremely high-dosed • Strong muscle pump with pre-workout intake • Optimizes your blood circulation during training • Packaged in environmentally friendly mono-plastic bags