NOW Foods L-Glutamine Double Strength 1000 mg delivers the most abundant free amino acid in the human body at a therapeutic double-strength dose of 1,000 mg per capsule. Glutamine is the primary fuel source for rapidly dividing cells — particularly intestinal enterocytes (the cells lining the gut) and immune cells — making it essential for maintaining gut barrier integrity and supporting immune function during times of stress. Athletes use glutamine to support muscle recovery and reduce exercise-induced breakdown, as skeletal muscle is both a primary storage site and consumer of glutamine. During illness, surgery, or intense training, glutamine demand often outpaces endogenous production, making supplementation valuable. NOW Foods delivers pharmaceutical-grade L-glutamine in a convenient double-strength dose, manufactured in their GMP-certified facility with identity and potency verification.