L-Arginine

How does L-arginine work?

L-arginine is converted in the body into a chemical called nitric oxide. Nitric oxide causes blood vessels to open wider for improved blood flow. L-arginine also stimulates the release of growth hormone, insulin, and other substances in the body.

Are there safety concerns?

L-arginine is safe for most people when taken appropriately by mouth. It can cause some side effects such as abdominal pain, bloating, diarrhea, gout, blood abnormalities, allergies, airway inflammation, worsening of asthma, and low blood pressure.

Do not use L-arginine if:
  • You are pregnant or breast-feeding.
  • You have allergies or asthma.
  • You have cirrhosis of the liver.
  • You have herpes.
  • Your have low blood pressure.
  • You have recently had a heart attack.
  • You are scheduled for surgery in the next two weeks.

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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.