Molecular model showing a ribbon representation of human serum albumin in complex with salicylic acid, which is shown spacefilled and element-coloured. Human serum albumin (HSA) is the most abundant protein in human blood plasma. It acts as a carrier molecule, transporting various endogenous (produced within the body) and exogenous (introduced from outside) substances throughout the bloodstream. Salicylic acid is a well-known pain reliever and anti-inflammatory drug. Understanding how HSA binds to salicylic acid can provide insights into the drugs transport and distribution within the body.