Chitosan is an insoluble or non digestible fiber. Marine sourced chitosan is produced from chitin, which is part of the shells of crustaceans including shrimp, crabs and lobsters. Suggest that a diet rich in fiber can help reduce the transit time of foods in the digestive system so less is available to be absorbed. Additionally, chitosan is not digestible and therefore has no caloric value. TaIngredients:Supplement Facts Serving Size:4 VegCapsAmount Per Serving% Daily ValueTotal Carbohydrate4 g1%Dietary Fiber3 g12%Chitosan (shellfish)3,000 mg*Percent Daily Values are based on a 2,000 calorie diet.* Daily Value not established. Other ingredients: Vegetable cellulose (capsule) cellulose, magnesium stearate and silica.