Hydroxymethylbutyric Acid, often abbreviated as HMB, is a compound that is produced in the body from the amino acid leucine. It is primarily known for its role in muscle health and recovery, making it popular among athletes and bodybuilders. HMB is believed to help reduce muscle breakdown and promote muscle growth, especially during periods of intense training or calorie restriction. HMB is available as a dietary supplement and is often marketed for its potential benefits in enhancing strength and improving exercise performance. Research suggests that it may also support overall health by aiding in fat loss and improving body composition. However, more studies are needed to fully understand its effects and optimal usage.