The vaginal gel, which is 98% effective, consists of tiny, fibrous compounds called chitosans, which are sugars n the exoskeletons of lobsters and replaces hormones used in traditional birth control.The vaginal gel, which is 98% effective, consists of tiny, fibrous compounds called chitosans, which are sugars n the exoskeletons of lobsters and replaces hormones used in traditional birth control.Read MoreHealth News | Mail Online