Guanidinoethyl sulfonate is primarily used in biochemical research as a competitive inhibitor of taurine transport. It is particularly valuable in studies aimed at understanding the mechanisms of taurine uptake in various cell types, including neuronal and renal cells. By blocking taurine transporters, it helps researchers investigate the physiological roles of taurine in processes such as osmoregulation, neurotransmission, and cell protection. Additionally, it is employed in experimental models to explore the impact of taurine deficiency on cellular function and to develop potential therapeutic strategies for conditions related to taurine dysregulation.