LysoFos Cholines, pure synthetic lysophosphatidylcholines for membrane protein and cell biology applications, are >99% pure by HPLC and have low background absorbance (<0.08 at 280 nm) and conductance (<200 µS) specifications. Five different acyl chain lengths (C10, C12, C14, C16, and C18) provide lysophospholipids with a range of physical properties.