(2-Hydroxypropyl)-gamma-cyclodextrin is a water-soluble alkylated cyclodextrin derivative. It can help improve the solubility of the drug in oral preparations or preparations. (2-Hydroxypropyl)-gamma-cyclodextrin is used for the dissolution of macromolecules and cell culture applications. (2-Hydroxypropyl)-gamma-cyclodextrin has been used to study its inhibitory effect on complement products and the inflammation induced by cholesterol crystals (CC) in plasma samples.