Charles Johnson is the president and creator of Dexter Sport Science and Powerstar.
His interest in sports nutritionals and supplements began while weight-training in the army. Numerous ads appeared in sports magazines for companies selling sports supplements and he began to consistently use these products to enhance his workouts.

He was firmly convinced in the importance of supplements to improve gains and energy. After leaving the army, he began selling supplements; starting out small "out of the trunk of his car" and then obtaining his wholesale license. Dexter Sports Supplements was created December 1990 and incorporated in October 1992.

The business began advertising in body building and workout magazines in Spring 1991 while being operated out of Charles' private residence. He soon moved the business to a larger facility on Carthage St. in Sanford, NC in June 1992. As the business grew, he was able to build and occupy a large warehouse in Carthage, NC in 1993.

Powerstar, the Dexter Sports Supplements house brand, was founded in 1994 and was granted a federally registered trademark in October 1995. The house brand was created to offer much better values to customers with formulas that mirror much more expensive products while also increasing the profitability of the company.

In addition to managing his business, Charles was also very busy training and competing in body building. He attributed his success to the use of his products and modeled in the company's many catalogs over the years. He has competed in over 40 contests in 8 eastern U.S. states, always placing in the top three and winning 4 Overall Bests in his category. These victories were used to endorse his products and contributed to the increased popularity of the Powerstar brand.

Not content with just his Body Building success, he began competitive sprinting in 1995. He competed in over 20 meets in 7 eastern U.S. states, with gold medals in several meets including the 1999 USATF Midwest Outdoor Championships 200 & 400 meter and the 1999 USATF Midwest Indoor Championships 55 & 400 meter sprints. This also led to expansion of the Powerstar line to include products targeted to endurance and recovery.

Dexter Sports Supplements and Powerstar continue to market products to the end user consumer via catalog mailings, the company website and email campaigns sent to an opt-in mailing list.