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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.
Dosage, length of use and when to take L-arginine will differ based on use and health status. Duration: According to WebMD, clinical trials indicate arginine can be safely used with only a few minor side effects for up to three months. Some of the minor side effects include bloating, diarrhea and abdominal pain.