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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.
L-Arginine is a conditionally essential amino acid. It is important for blood flow and nitric oxide levels, but oral supplementation may not reliably improve blood flow in humans. This page features 182 unique references to scientific papers.