ORM1, also known as Orosomucoid 1 or Alpha-1-acid glycoprotein 1, is a glycoprotein primarily produced in the liver and released into the bloodstream. It is part of the acute-phase reactant proteins, which are synthesised in response to inflammation, infection, or tissue injury. ORM1 plays a key role in modulating the immune response and inflammation. During acute-phase reactions, its production is increased by pro-inflammatory cytokines, such as interleukin-6 (IL-6) and tumour necrosis factor-alpha (TNF-α). ORM1 helps regulate inflammation by binding to various molecules, including drugs, hormones, and lipids, and influencing their distribution.