HSD17B13, also known as Hydroxysteroid 17-beta dehydrogenase 13, is an enzyme primarily found in the liver and is involved in the metabolism of steroid hormones and fatty acids. It belongs to the hydroxysteroid (17-beta) dehydrogenase (HSD17B) family, which catalyzes the conversion of hydroxysteroids to ketosteroids and vice versa. HSD17B13 plays a key role in fatty acid metabolism, particularly in the oxidation of long-chain fatty acids, and is localized to the peroxisomes — cellular organelles responsible for fatty acid processing. Its enzymatic activity is essential for converting long-chain fatty acyl-CoAs into 3-ketoacyl-CoAs, supporting proper liver function and lipid metabolism.