Glycerol, USP Grade, 500 Milliliters, is a laboratory-grade reagent commonly used in microbiology, biochemistry, and molecular biology. It serves as a humectant, helping to retain moisture in biological samples and laboratory formulations. Glycerol is frequently used in cell preservation, enzyme storage, and the preparation of cryopreservation solutions. It is also used in the formulation of buffer solutions, reagents, and for creating glycerol stocks of bacterial cultures for long-term storage. The USP grade ensures that this glycerol meets the highest standards for purity, making it suitable for sensitive biological experiments and pharmaceutical research.