Research published in the Journal of Applied Research has demonstrated that Hmb increases muscle mass by stimulating protein synthesis and decreasing breakdown after hard workouts. With less catabolic muscle damage to repair, your body has enhanced capacity for building size and strength. Each serving of Optimum Nutrition Hmb 1000 provides 3 grams (per serving) of Hmb to help highly trained muscles combat protein breakdown, assist in muscle repair, and support increased endurance.