 When the amino acid solution has been completely given, approximately 9 hours, you will be able to go home and resume your activities. You will be asked to return to the GCRC to give blood samples on days 3, 4, and 5 after this procedure just as you did after the first admission. You will then be finished with the study. You will be given a 30 day supply of vitamin and mineral supplements to be taken daily to be sure that your body gets adequate amounts of vitamin B6 and other nutrients. 