The supplement company announced the decision on Friday.
Company president Scott Henderson said last week at New Hampshire that he wanted to finish the season before making a decision. But 5-Hour said the number of people impacted by its decision made the company move up the timetable. Bowyer will continue to drive the No. 15 car with 5-Hour Energy as his primary sponsor.
NAPA Auto Parts said last week it will end its multimillion-dollar sponsorship of MWR at the end of the year, the latest fallout from the team's attempt to manipulate the results of the regular season's last race to get Martin Truex Jr. into NASCAR's version of the playoffs.
Aaron's, sponsor of MWR's Brian Vickers, has said it remains dedicated to the organization.
MWR was also fined $300,000, general manager Ty Norris was suspended indefinitely and all three crew chiefs for its drivers were placed on probation for the rest of the year following the Sept. 7 race at Richmond.