l-Glutamine Helps Stimulate the Immune System If you take good care of your digestive tract, it will take good care of you. In the e-Alert "Gut Reaction" (9/20/05), I told you about a study in which a probiotic bacteria supplement, combined with supplements of vitamins and minerals, was shown to reduce the frequency of respiratory tract infections and the symptoms that go along with those infections. Probiotic supplements help increase the good bacteria in the intestines. But not all such supplements contain the elements necessary to be truly helpful. HSI Panelist Richard Cohan, D.D.S., sent me an e-mail with this useful inf "Just want to add that when a probiotic is indicated, such as to daily supplement the diet or to counteract the disruptive effects of antibiotics, it's a good idea to use a formula that contains multiple good microorganisms and FOS (fructooligosaccharides) to help them reach the small intestine intact. FOS is considered a prebiotic." A prebiotic is a carbohydrate that prompts the growth and activity of probiotics in the digestive tract. Dr. Cohan adds that in some cases an l-glutamine supplement may also be useful, "as it can help maintain the mucous lining of the gut." As I've mentioned in previous e-Alerts, l-glutamine helps stimulate the immune system and is one of the precursors of the highly effective antioxidant glutathione. Dietary sources of l-glutamine include meats, fresh fruits and vegetables. L-glutamine supplements are also widely available. Be sure to consult with your doctor or a healthcare professional before starting any new supplement regimen. | 
