C1 Esterase Inhibitor (Human) is a glycoprotein derived from human plasma and acts as a serine protease inhibitor. It inactivates enzymes like C1r, C1s, and mannose-binding lectin-associated serine proteases (MASP) through covalent binding. This compound possesses anti-inflammatory properties and is utilized to prevent angioedema attacks associated with hereditary angioedema.