The present invention is a method for storing a liposome or nanoparticle formulation formed by the combination of at least one phospholipid, at least one surfactant and at least one hydrophilic polymer. The method includes freezing such a formulation, and storing it for a period of at least three days.本發明係一種用於儲存脂質體或奈米微粒調合物之方法,該脂質體或奈米微粒調合物係藉由結合至少一種磷脂、至少一種界面活性劑與至少一種親水性聚合物而形成。該方法包括冷凍此種調合物,並儲存彼至少三天。