Girard’s Reagent P is widely used in organic chemistry for the isolation and purification of carbonyl compounds, such as aldehydes and ketones. It forms water-soluble hydrazones with these compounds, allowing them to be separated from non-carbonyl impurities. This reagent is particularly valuable in the extraction and analysis of steroids, hormones, and other bioactive molecules containing carbonyl groups. It is also employed in the derivatization of carbonyl compounds for analytical techniques like chromatography and mass spectrometry, enhancing detection and quantification. Additionally, Girard’s Reagent P is useful in synthetic chemistry for protecting carbonyl groups during multi-step reactions, ensuring selective transformations. Its applications extend to pharmaceutical research, where it aids in the purification and characterization of drug intermediates and active ingredients.