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. Stereoinversion of L-Phe (in CHHB-I) to D-Phe (in CHHB-II). Belongs to the arthropod CHH/MIH/GIH/VIH hormone family.