375 Calories. Peptamen 1.5 is a high calorie, high protein, 100% whey, enzymatically hydrolyzed, complete elemental medical food for GI-compromised patients. Designed for tube feeding or oral use, Peptamen 1.5 features a unique peptide profile, antioxidant system, and lipid blend. Meets or exceeds 100% of the RDI for 22 key vitamins and minerals in 1000 ml (4 cans). Osmolality is 550 mOsm/kg water. 1.5 kcal/ml. 67.6 g Protein/lt. Lactose and gluten free (not for individuals with galactosemia). Not for parenteral use. May be stored unopened at room temperature. For oral use, best served chilled. Do not freeze. Shake well before opening. Once opened, unused portions should be tightly covered, refrigerated, and used within 24 hours.