Cellucor G4 C4 Mass Brian E. December 11, 2014 Pre-Workout Reviews, Reviews Soon you’ll be able to get your hands on Cellucor’s C4 Mass from the brand new G4 series. This is reputedly a non-stimulant pre-workout, so you’ll be able to stack it with other versions of C4 or another pre-workout. Not much information is available right now, but I’ll provide a complete review as soon as C4 Mass officially launches. Leave a Reply Cancel Reply Your email address will not be published.CommentName* Email* Website To leave a comment please enable JavaScript in your browser settings!