Can, but the quantity is very little. Because in the natural state, the properties of chitin is very stable and very large molecular weight (more than 100 million), are not able to be absorbed. In normal circumstances and are not easy to be decomposed, usually eat shrimp or squid by hydrochloric acid in gastric juice and enzyme in vivo, get very little, and through high-tech biological engineering conversion and extraction, removal of acetyl and biological degradation complex processes can put into the chitosan oligosaccharide, is used.