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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.
Because L-arginine acts as a vasodilator, opening (dilating) blood vessels, many people take oral L-arginine to try to treat cardiovascular conditions and erectile dysfunction. Evidence Research on the use of L-arginine for specific conditions shows: Angina. Studies suggest that L-arginine might decrease symptoms and improve quality of life in people with a mild to severe form of this type of chest pain. High blood pressure (hypertension).