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Natural Factors L-Glutamine enhances muscle recovery, energy, and immunity. As a free-form amino acid, it is more effective than the form obtained directly from food. Supplementing with L-glutamine helps restore levels lost during strenuous exercise and speed up recovery. It also improves digestive health and supports normal brain function. Medicinal Ingredients. Each vegetarian capsule contains: L-glutamine 500 mgNon-Medicinal Ingredients. Vegetarian capsule (carbohydrate gum [cellulose], purif...