Abstract: There is disclosed a recombinant pharmaceutical composition comprising a large plurality of recombinant immunoglobulins made by expression of a wide diversity of antibodies from a recombinant antibody library, preferably obtained from a wide diversity of human sources, synthetic or semi-synthetic germline immunoglobulin sequences, or a combination thereof, and then purified. Mammalian cell expression antibody libraries normally produce antibodies with significant diversity or different antibodies that bind to different targets. There is further disclosed a recombinant pharmaceutical composition made from a mammalian expression library configured to excrete, rather than display their antibodies on the cell surface, and then purified to form the pharmaceutical composition from the excreted antibodies.