Enables neuropeptide hormone activity. Acts upstream of or within several processes, including glucose homeostasis; insulin secretion; and response to insulin. Predicted to be located in several cellular components, including Golgi apparatus; neuronal cell body; and secretory granule membrane. Predicted to be active in extracellular space. Is expressed in brain. Orthologous to human VGF (VGF nerve growth factor inducible). [provided by Alliance of Genome Resources, Apr 2022]