Hormone found in the sinus gland of isopods and decapods which controls the blood sugar level. Has a secretagogue action over the amylase released from the midgut gland. May act as a stress hormone and may be involved in the control of molting and reproduction. Produced by the medulla terminalis X-organ in the eyestalks and transported to the sinus gland where they are stored and released. The N-terminus is blocked only in isoform CHH-II but not in isoform CHH-I. Belongs to the arthropod CHH/MIH/GIH/VIH hormone family.