Brand: NOVARTIS NUTRITION CORPORATION Category: Standard: Enteral Tube Feeding Isosource? 1.5 Cal: Isosource 1.5 Cal?formula is a high-calorie, high-nitrogen, complete liquid formula with fiber. NutriShield? ingredients added to formulas in closed system containers provides a level of microbial protection only available from Novartis Medical Nutrition. Isosource 1.5 Cal formula is a Medical Food -- consumers should consult with their physician on the use of this product. 1000 mL Closed System Containers.