Used primarily in molecular biology and biochemistry for tracking DNA and RNA samples during gel electrophoresis. It provides a visual marker to monitor the progress of the migration of nucleic acids through the gel. The glycerol content increases the density of the sample, ensuring it sinks properly into the wells of the gel. It is often mixed with tracking dyes to help estimate the size of separated fragments. Commonly applied in agarose gel electrophoresis for analyzing PCR products, plasmid preparations, and other nucleic acid samples.