The way it works is to stimulate the fish's chemoreceptors to motivate it to feed, much like certain foods and palatability enhancers do to humans and other animals. The natural enhancers are combined with a group of essential amino acids in such a profile that almost guarantees to supply fish with nutrients (and limiting amino acids) that they need but often find very difficult to source in their natural environment, particularly at times of the year when natural foods are less plentiful or even completely unavailable. This two pronged approach to attraction means that fish will pick up the baits that include this liquid either out of taste stimulation through water soluble attractors, association of taste from an enjoyable experience of eating baits that contain it in the past, or as a result of it supplying required nutrients that aren't available elsewhere in the fish's natural habitat.