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Stress Support 500 mg Per CapsuleDietary SupplementVegetarianSupports a Healthy Stress Response Helps Eliminate Excess Nitrogen Arginine Precursor Science-Backed Quality Since 1969The free-form amino acid L-ornithine is a key player in the urea cycle which helps eliminate excess nitrogen and synthesize arginine another important amino acid. Swanson L- Ornithine is a pure form of this vital amino acid suitable for daily supplementation.