NUTRITION AND THE INTENSIVE CARE UNIT: Edited by Peter J.M. Weijs and Stephen A. McClaveGlutamine and antioxidants status of their use in critical illnessvan Zanten, Arthur R.H.Author Information Department of Intensive Care, Gelderse Vallei Hospital, Ede, The Netherlands Correspondence to Arthur R.H. van Zanten, MD, PhD, Department of Intensive Care, Gelderse Vallei Hospital, Willy Brandtlaan 10, 6716 RP Ede, The Netherlands. Tel: +31-318-43-41-15; e-mail: firstname.lastname@example.org Current Opinion in Clinical Nutrition and Metabolic Care: March 2015 - Volume 18 - Issue 2 - p 179-186 doi: 10.1097/MCO.0000000000000152 Buy Metrics Abstract Purpose of review Many studies in critically ill patients have addressed enteral or parenteral supplementation of glutamine and antioxidants to counteract assumed deficiencies and induce immune-modulating effects to reduce infections and improve outcome. Older studies showed marked reductions in mortality, infectious morbidity and length of stay. Recent studies no longer show beneficial effects and in contrast even demonstrated increased mortality. This opiniating review focuses on the latest information and the consequences for the use of glutamine and antioxidants in critically ill patients. Recent findings Positive effects in systematic reviews and meta-analyses are based on results from older, smaller and mainly single-centre studies. New information has challenged the conditional deficiency hypothesis concerning glutamine in critically ill patients. The recent REDOXS and MetaPlus trials studying the effects of glutamine, selenium and other antioxidants have shown no benefits and increased mortality. Summary Given that the first dictum in medicine is to do no harm, we cannot be confident that immune-modulating nutrient supplementation with glutamine and antioxidants is effective and well tolerated for critically ill patients. Until more data are available, it is probably better not to routinely administer glutamine and antioxidants in nonphysiological doses to mechanically ventilated critically ill patients. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.