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Swanson Super-Strength L-Arginine is an antioxidant amino acid that helps encourage the production of nitric oxide, a compound that helps keep blood vessels dilated to promote blood flow. Choose capsules or our easy-mixing Arginine AKG Powder . FAQs Q: What does the "L" stand for? A: The "L" designates the free-form amino acid that is most bioavailable. Q: A powdered arginine suggests a daily dosage of 4.6 grams (4,600 mgs) per day of L-Arginine, whereas SW1293 suggests up to 2 capsules of 900 mgs per day or 1800 mgs total. How do you explain this? A: For many supplements, there is a range of use varying from light general maintenance to more intensive support. Each individual should select the degree of support that suits his or her specific needs. Q: What's the difference between L-Arginine and Arginine AKG? A: Arginine AKG has arginine bound to Alpha Ketoglutarate to enhance absorption and utilization.