- HIGH-CALORIE MASS GAINER: GNC Pro Performance Bulk 1340 is a scientifically formulated mass gainer that delivers 1,340 calories per serving and 50g of high-quality protein to help you increase size and overall strength when used in conjunction with an exercise program.
- RECOVER WITH BCAA: Formula features 11g branched chain amino acids (BCAA) and glutamine, an important amino acid which is involved in protein synthesis and plays an important role in hydrating muscle cells.
- BANNED SUBSTANCE-FREE MASS GAINER: Bulk 1340 Mass Gainer has been tested for over 145 banned substances and is and certified Banned Substance.^
- BACKED BY SCIENCE: Since 1935, GNC has been committed to meeting the highest standards of quality, safety and efficacy while applying the most up-to-date advances in nutritional science so you can live well.
- Branched Chain Amino Acids May Help Reduce Muscle Protein Breakdown.