2-Methyl-3-hydroxybutyric acid is a chiral hydroxy acid. It is a colorless to pale yellow liquid with a characteristic odor. Structurally, it contains both a carboxylic acid and a secondary alcohol functional group on a short carbon chain, making it a versatile chiral building block. This compound is primarily known and used as a flavoring agent and fragrance ingredient in the food and cosmetic industries. It imparts fruity, creamy, and buttery notes, contributing to the aroma profiles of various products. Its chiral nature is significant in these applications, as different enantiomers can have distinct sensory properties. From a synthetic chemistry perspective, 2-methyl-3-hydroxybutyric acid serves as a useful chiral synthon. The presence of the hydroxyl and carboxyl groups allows for further chemical modifications, making it applicable in the synthesis of more complex molecules, including potential pharmaceuticals or fine chemicals where chirality is crucial.