The Efficacy of Amino Acid Supplementation in Treating Environmental Enteric Dysfunction Among Children At Risk of Malnutrition

Inclusion Criteria: * All children identified from the Mangochi DSS whose guardian/parent desires screening will be eligible for screening. This will first include age, weight, length, and MUAC assessment. If a participant meets age and anthropometric criteria, they will be invited to undergo full inclusion/exclusion criteria assessment, consent, and randomization. In order to be eligible to participate in the study, an individual must meet all of the following criteria: 1. 18-36 months old (now agreed to by all countries) 2. Stunted (LAZ\<-2) 3. Of either sex 4. Able and willing to undergo HIV testing 5. Parent, carer, or guardian able and willing to give written, informed consent 6. A positive HIV test result will not be an exclusion criterion. Exclusion Criteria: * An individual who meets any of the following criteria will be excluded from participation in this study: 1. Under 18 months of age 2. Over 36 months old 3. Wasted (weight-for-length Z-score less than -2) 4. Overweight (weight-for-length Z-score greater than 2) 5. Have had diarrhea (by self-report) in the preceding month 6. Sibling or twin of another participating study child (2 children of different families in the same household are both eligible) 7. Have any underlying condition other than HIV, which in the opinion of the investigator would put the subject at undue risk of failing study completion or would interfere with analysis of study results