We understand that you may have some concerns about taking supplements that contain L-Glutamine. The supplement GI Revive is an important part of the Gut Thrive program. We chose to include it in the Gut Thrive protocol because it is highly effective in promoting a healthy GI lining which assists in reducing inflammation and supporting the body's immune system. Although glutamine is a necessary nutrient that is required for our brains to function properly and is found in many of the foods we eat, there is some evidence that high quantities of glutamine may be counter productive for cancer patients. In the event that you would like to substitute another product for GI Revive, we recommend that you use GI Encap.