Phenyl β-D Galactopyranoside (P Gal) is a high-quality biochemical reagent, commonly used for studying β-galactosidase activity in genetic research and enzyme assays. The compound, when hydrolyzed by β-galactosidase, releases phenol, which can be easily measured to assess enzyme activity. The 5g quantity is suitable for larger scale experiments and is a crucial reagent in applications such as gene regulation studies, enzymology, and microbiological diagnostics. It is also widely employed in colorimetric and fluorometric assays to quantify enzyme function in cellular systems. This reagent is essential for understanding metabolic pathways and the behavior of galactosidases in various biological contexts.