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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.
Any drug or supplement can cause side effects. L-arginine is no exception. L-arginine affects the way your body handles waste, so it can have adverse effects on the organs involved in waste disposal. Some liver and kidney problems can be exacerbated by L-arginine. Using L-arginine can also lead to problems of potassium balance and dehydration, as well as stomach cramps, nausea and other digestive discomfort [source: MedlinePlus]. Keep Reading Below There can also be some circulatory side effects associated with L-arginine.