Pure Calcium HMB From The Asylum! Builds Lean Muscle Mass Improves Aerobic Exercise Performance Supports Muscle Recovery If you need to add any supplement to your rotation, HMB is that supplement hands down. What are the benefits of HMB when added to your workout? Most importantly, HMB reduces protein breakdown which allows protein synthesis to build new lean muscle mass. HMB is an anti-catabolic supplement as well. For those of you that are in a calorie-deficit training program, HMB is the perfect addition. Therefore, HMB decreases muscle loss after exercise. Note: Manufacturers continually change product specifications. While we try our best to keep product descriptions up to date, they do not necessarily reflect the latest information available from the manufacturer. We are not responsible for incorrect or outdated product descriptions and/or images.