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Stress Support500 mg Per CapsuleFree FormDietary SupplementSupports a Healthy Natural Response to Daily StressSupports Nervous System HealthProvides Antioxidant SupportScience-Backed Quality Since 1969Stressed? When tensions run high is when you need Swanson L-Lysine the most. L-lysine is classified as an essential amino acid because our bodies need it every day for regulating immune responses. But when we're under increased stress our need for L-lysine increases even further. Our Free-Form L-Lysine capsules are a great way to meet the additional demands of high-stress times.