Food comes into the small digestive system from the stomach through the uppermost piece of the small digestive tract, known as the duodenum. This area of the small digestive system makes up around one-fifth of the absolute length of the organ and gets a semisolid muck of somewhat processed food from the stomach. Bile and chemicals from the liver, pancreas and gallbladder help further separate the food in the duodenum. The center area, around two-fifths of the length of the small digestive system, is known as the jejunum, and the last segment is the ileum. The essential capacity of both of these segments is to retain supplements into the circulation system. Both the jejunum and the ileum have linings with numerous folds that expansion the surface zone of the small digestive tract (around 2,700 square feet or 250 square meters) for expanded supplement assimilation. These folds contain little, finger-like cells known as villi, which are each secured with a layer of microvilli (tiny hair-like structures) that further increment the surface territory accessible for supplement assimilation.

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