Hydroxybutyric acid is a chemical compound found in the body that is involved in the metabolism of fats. It is also used as a medicine for various medical conditions. Synonyms for hydroxybutyric acid include 3-hydroxybutyric acid, β-hydroxybutyric acid, and 3-hydroxybutanoic acid. These synonyms are used interchangeably in scientific literature and medical research. Hydroxybutyric acid is an important biomolecule that plays a critical role in a range of metabolic processes. Understanding the various synonyms for hydroxybutyric acid is helpful for researchers, clinicians, and medical professionals who work with this compound and its many applications.