With NutraShield. High nitrogen with Benefiber soluble fiber. Ready to use. 300 calories. Lactose free. With fiber. Fibersource HN formula is a high nitrogen nutritionally complete liquid medical food with fiber, specifically formulated for the management of malnutrition and other medical conditions with increased nutritional needs. Caloric Distribution: protein - 18%; fat - 29%; carbohydrate - 53%. Water Content: 203 ml/250 ml. Osmolality: 490 mOsm/kg water.