beta-hydroxybutyrate

Beta-hydroxybutyrate is a type of molecule called a ketone body that your body produces when it needs an alternative energy source, especially during fasting, prolonged exercise, or low carbohydrate diets. When glucose, the usual energy source, is scarce, your liver converts fats into ketones like beta-hydroxybutyrate, which can be used by your brain, muscles, and other tissues for fuel. It plays an important role in maintaining energy levels and supporting brain function when carbohydrate intake is limited.