What Is the Scientific Evidence for Glutamine?
Endurance exercise temporarily reduces immunity to infection. This effect may be due in part to reduction of glutamine in the body, although not all studies agree.19-23,34 A double-blind, placebo-controlled study evaluated the benefits of supplemental glutamine (5 g) taken at the end of exercise in 151 endurance athletes.24 The results showed a significant decrease in infections among treated athletes. Only 19% of the athletes taking glutamine got sick, as compared to 51% of those on placebo. For other approaches to this problem, see the article titled Sports and Fitness Support: Aids to Recovery.
