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Cellucor is a sports supplement brand of the supplement manufacturer Nutrabolt, founded in 2002 and based in Austin Texas, USA. In addition to Cellucor, Nutrabolt also markets the Xtend brand, which focuses primarily on protein and amino acid products. The Cellucor brand was launched on the market in 2002. Cellucor's products traditionally include primarily pre-workout boosters and fat burners, but for some time now also products such as protein powder and amino acid mixtures.

Cellucor's best-known product by far is the training booster C4, new and modified versions of which have been launched on the market time and again over the years. Cellucor's target group mainly includes recreational and competitive athletes who want to maximize their athletic performance and want an energy boost for extreme training sessions, as well as people who want to lose fat quickly.