Isosource® 1.5 Cal Tube Feeding Formula Unflavored Liquid 1000 mL Ready to Hang Prefilled Container (693715_CS) 6/CSNestle's Isosource 1. 5 tube feeding formula is calorically dense, serving the dietary needs of those with limited fluid tolerance. Soluble fiber supports healthy digestion, while insoluble fiber improves bowel function. Isosource 1. 5 nutritionally complete formula contains vitamins and nutrients such as vitamin C and folic acid. Casein soy protein maintains lean body mass and muscle. Canola oil supplies essential fats and omega 3 fatty acid. The