Glutamine Supplementation in People With Immune Dysregulation

Background: Glutamine is an amino acid. People get amino acids from food or from the body s cells. The body needs amino acids to stay healthy. Glutamine might help treat some people with immune system problems like atopic dermatitis. Objective: To study the safety and effectiveness of glutamine supplements for people with certain immune system problems. Eligibility: People ages 5-65 with atopic dermatitis and other immune system problems Design: Participants will be screened in another protocol. Participants will have 8 visits. Visit 1 includes: Physical exam Medical history Blood and urine tests Saliva sample Nutrition assessment For participants with AD, photographs of the skin Participants will get a diary to record their symptoms every day during the study. They will record any glutamine side effects and bring the diary to every visit. Visit 2 is about 1 month after visit 1. Participants will repeat visit 1 tests and get glutamine to take home. It is a powder that can be added to drinks or food. They will take it twice a day for 3 months. They will record their doses in a diary each day and bring the diary to all visits. Participants will have a phone call 5 days after starting glutamine to discuss how they are feeling. Visit 3 is about 7 days after participants start taking glutamine. They will have blood tests. Visits 4, 5, and 6 occur each month participants are taking glutamine. Participants will repeat visit 1 tests. Participants will stop taking glutamine after visit 6. Visits 7 and 8 occur 1 and 3 months after participants stop taking glutamine. Participants will repeat visit 1 tests.