This invention relates to crystals of whole antibodies and fragments thereof, and formulations and compositions comprising such crystals. More particularly, methods are provided for the 
crystallization of high concentrations of whole antibodies, and fragments thereof, in large batches, and for the preparation of stabilized whole 
antibody crystals for use alone, or in dry or 
slurry formulations or compositions. This invention also relates to methods for stabilization, storage and delivery of biologically active whole 
antibody crystals. The present invention further relates to methods using whole 
antibody crystals, antibody fragment crystals, or compositions or formulations comprising such crystals for biomedical applications, including biological delivery to humans and animals. More particularly, whole antibody crystals or antibody fragment crystals, or 
crystal compositions or formulations thereof, are used as a carrier-free 
delivery system which can slowly release active whole antibodies or fragments thereof, to a subject, where and when they are needed.