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Intravenous Immunoglobulin Market | Global Analysis Report 2031 Immunoglobulins are highly purified, sterile-specific medical therapy solutions containing gamma globulin G (IgG) in a concentration of 95% or more. These are manufactured from a highly refined pool of human plasma collected from at least 100 donors or more. Immunoglobulins can be administered through three different routes such as intramuscular, intravenous, and subcutaneous. The intramuscular route of administration is a relatively older method and is not preferred presently, as it is painful. Intravenous immunoglobulin has emerged as a boon in the last few decades for patients with compromised immune systems.