Protocol ALCT-0000497 consists of three distinct study periods as follows:
1. In Period A (7 days), subjects will receive Peptamen 1.5 enteral feedings at home.
2. In Period B (11 days), subjects will be randomized to either Group A (active investigational then placebo control) or Group B (placebo control then active investigational) and receive Impact Peptide 1.5 on Days 1 and 9. During the 8-day washout period between Days 1 and 9, subjects will receive Peptamen 1.5.
3. In Period C (9 days), subjects will use RELiZORB during nocturnal enteral feedings with Impact Peptide 1.5.
