BCAAs in Concussion 3.0

Inclusion Criteria: 1. Males and females,11 - 23 years of age. 2. Weigh at least 40kg. 3. Meeting concussion criteria for the American Congress of Rehabilitative Medicine. a. One or more clinical signs or two or more acute symptoms with at least one VVE abnormality. 4. Present within 4 days of injury. 5. Post-menarchal females must have a negative urine pregnancy test. 6. Informed consent by the participant, or for participants \<18 years old both informed consent by a parent/guardian and child assent. Exclusion Criteria: 1. Evidence of moderate or severe TBI, including GCS \<13, TBI requiring hospital admission, or TBI requiring neurosurgical intervention. 2. Prior concussion or TBI within 90 days. 3. Known history of maple syrup urine disease or known family history of maple syrup urine disease. 4. Any investigational drug use within 30 days prior to enrollment. 5. Participants who are pregnant, planning on becoming pregnant during the study duration, or breastfeeding. 6. Non-English speaking participants or parent/guardian.