GNC AMP Mass XXX™ – Cookies and Cream: Increase Lean Muscle Mass with 40% Fewer Sets.◆*
You can get even more out of every workout session when you make GNC AMP Mass XXX™ a part of your exercise routine. This protein-packed dietary supplement is clinically proven to help increase lean muscle mass with 40% fewer sets.◆* Plus, 3g each of Tri-MG Infusion™ and Creatine Matrix Blend help support athletic performance* and muscle protein synthesis^*, while micronized amino acids support key processes crucial to muscle growth and repair.^*

Clinically proven to help increase lean muscle mass, weight, strength and endurance with 40% fewer sets◆*
50g of fast-, medium- and slow-digesting proteins, along with 11g of BCAA, 750 calories, plus carbohydrates and healthy fats for science-based nutrition, advanced muscle performance^* and to help maximize gains*
Creatine Matrix Blend with 3 forms of creatine may help improve training results and supports muscle protein synthesis^*
Tri-MG Infusion™ is an powerful blend that delivers relentless support for athletic performance*
Micronized amino acids help fuel muscles* and support key processes crucial to the growth and repair of muscle^*
Gluten-free dietary supplement
Naturally- and artificially-flavored, delicious cookies and cream taste
Disclaimers:

◆In an eight-week, randomized, double-blind, placebo-controlled study of healthy male volunteers, 18 subjects completed 3 sets of resistance training (RT) daily + the macronutrient blend in Mass XXX™, and 16 subjects performed 5 sets RT daily with no supplement. After eight weeks, subjects on the supplement showed equal gains in body weight, fat free mass (FFM), maximal muscle strength (MMS) and muscle endurance (ME) with only 3 sets RT per day compared to the control group who completed 5 sets RT per day.

^When used in conjunction with an exercise program.