Chitosan is a unique fat-absorbing dietary fiber derived from crab chitin. We use Vanson Liposan Ultra® Chitosan, which rapidly dissolves (solubilizes) in stomach acid. Greater solubilization means that Chitosan binds to ingested dietary fat almost immediately, greatly reducing the amount absorbed during digestion. Studies show that Lipoosan Ultra® Chitosan binds several times more dietary fat than other leading national brands.* Look for this and other fine NOW® products in health food stores nationwide.