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Side Effects of L-arginine Hydrochloride For most people, taking L-arginine hydrochloride is thought to be relatively safe. Possible side effects of using L-arginine HCL capsules or powder include bloating, diarrhea, abdominal pain, gout, abnormalities in blood circulation, low blood pressure, inflammation of the lungs and airways, allergies and worsening of asthma symptoms. High-doses of L-arginine may be potentially fatal in children.
Among its many roles, L-Arginine: 1  Is a precursor of nitric oxide (NO) 2  Promotes circulation resulting in improved blood flow. 3  Stimulates the release of growth hormone. 4  Improves immune function. 5  Reduces healing time of injuries. 6  Plays a role in the formation of bone and tendons. 7  Increases muscle mass, while reducing body fat.