Shown to reduce muscle damage following resistance training! This is ß-hydroxy-ß-methylbutyrate. A naturally produced metabolite of the BCAA leucine, normally found only in small quantities in the body. But supplementing with this amazing, well-researched and effective nutrient could actually help reduce muscle breakdown caused by training.If you trainig hard try combining HMB with creatine to stack the effects. Available in high dose 1000 mg capsules.