Ketone esters are a type of compound that combines a ketone with an ester. They are often used as a dietary supplement to provide an alternative energy source for the body, particularly during low-carbohydrate diets like the ketogenic diet. When consumed, ketone esters can increase the levels of ketones in the blood, which can be used by the brain and muscles for energy. These compounds are gaining attention for their potential benefits in enhancing athletic performance and cognitive function. Research suggests that ketone esters may help improve endurance and reduce fatigue during exercise. Additionally, they are being studied for their possible therapeutic effects in conditions like Alzheimer's disease and epilepsy.