Which form of glutamine is used in oral nutrition supplements?

• A. L-glutamine powder
• B. L-glutamine capsules
• C. D-glutamine powder
• D. Free glutamine solution

Answer: (B)

Glutamine that the body can use is the L-enantiomer, while the D form is not utilized in human metabolism. For oral nutrition supplements, stability and dosing control are important, and free glutamine in liquid form tends to be unstable. Solid dosage forms are preferred, with capsules offering a convenient, stable, and dose-accurate delivery of the active L-glutamine. While L-glutamine powder is also common, capsules are a typical presentation in many oral supplements, making this option the best fit.