Recombinant albumin is a protein produced in the laboratory using recombinant DNA technology. It is used in cell cultures to provide essential nutrients for cell growth and health. Conditioned media is a form of cell culture media that has been exposed to cells and contains cell-derived factors such as proteins and hormones. It is commonly used to promote cell health and growth, and can be used in place of fresh media in cell culture processes. Conditioned media can be used to supplement the culture with additional factors such as growth factors and hormones, or to replace certain components such as serum or antibiotics.