What is the composition of the FcR Blocking Reagent, human? Is it animal-based or synthetic?

Our FcR Blocking Reagent, human contains human IgG. It blocks the non-specific binding of antibodies of all these receptors, except for Fc epsilon RI, which only binds IgE, and Fc alpha RI, which binds IgA. Most commonly used antibodies are IgG and are blocked from binding non-specifically to FcR. The FcR Blocking Reagent, human is not synthetic and is prepared from human serum.