This 3-hydroxytetradecanoic acid is a high purity standard that is useful for the investigation of disorders and diseases. 3- Hydroxytetradecanoic acid is used as a biomarker for the molecular subunit endotoxin Lipid-A (where it is the most abundant saturated fatty acid) which is responsible for toxicity.1 Polyhydroxyalkenoates, polyesters produced by bacteria fermentation, are used for carbon and energy storage and are of interest in studies regarding their synthesis, properties and mechanisms. Medium chain-length polyhydroxyalkenoate monomers such as 3-hydroxytetradecanoic acid may have some pharmaceutical properties. 3-hydroxy fatty acids are used as biomarkers for fatty acid oxidative disorders of both the long- and short-chain 3- hydroxy-acyl-CoA dehydrogenases.2,3