Dietary Supplement For Cellular Immune Health Pectin, is a soluble dietary fiber naturally present in citrus fruit that cannot be absorbed by the human digestive tract. However pectin can be modified to shorten the molecular chain. This process creates smaller polysaccharide fragments that are easily absorbed and utilized in the body. Source Naturals Modified Citrus Pectin is made up of very short chains of molecules of the same molecular weight used in recent scientific studies. The constituents of Modified Citrus Pectin that are believed to be responsible for its beneficial properties are the galactosyl fractions. Their toxin-binding properties in the blood stream may help promote good health.