A method of preparing a therapeutic composition from the epidermal gelatinous secretion of catfish includes mixing catfish epidermal gel secretions (EGS) with phosphate buffered saline (pH 7.5) to provide an extract, homogenizing the extract to provide a homogenized extract, and centrifuging the homogenized extract to provide a soluble protein fraction and an insoluble protein fraction. The therapeutic composition can include about 87% soluble proteins and about 13% lipids.