Stacker 2® Xtra® Extreme† Berry Energy Shot. 0 calories. 12-2oz bottles. 0 sugar. Manufacturers of The World's Strongest Energy Shot®. Results may vary†. Tear at dotted line. Tamper evident. Results may vary. Tel: 973-786-7868. www.stacker2.com. ©2012 NVE Pharmaceuticals. All rights reserved.