Glucosylsphingosine (Lyso-Gb1) is a naturally occurring glycosyl ceramide, a metabolite of GBA (acid beta-glucosidase), involved in cellular recognition, signaling, and intercellular interactions.Glucopsychosine accumulates in certain neurodegenerative diseases (e.g., Gaucher disease), disrupts lysosomal function through activation of mammalian target of rapamycin complex 1 (mTORC1), and is a noncompetitive inhibitor of glucocerebrosidase.