Muscle Health and RecoveryDietary SupplementSupports Muscle Growth and Recovery, Digestive Health and Provides Fuel for ActivityAn Effective Brain Fuel that Helps to Maintain Healthy Cognitive FunctionScience-Backed Quality Since 1969Support muscle growth and recovery with Swanson L-Glutamine. Glutamine is the most abundant free amino acid found in the muscles of the body. Glutamine may also minimize muscle breakdown and improve protein metabolism. Glutamine may also benefit cognitive function and brain health. Each single-capsule serving delivers 500 mg of this powerful amino acid.