MusclePharm has faced several legal issues related to its stock and intellectual property infringement.
In May 2012, Marina Ventures sought to force MusclePharm's sale of 21 million shares of common stock. Inter-Mountain Capital sued MusclePharm for alleged failure to sell, seeking damages of $4 million.
In the same month, John's Lone Star Distribution alleged in a suit that MusclePharm entered into illegal price discrimination contracts with a Lone Star competitor with the intention of removing Lone Star from the market.
In 2011, Environmental Research Center (ERC) filed a notice of intent to start litigation against over 200 nutrition and supplement companies, including MusclePharm, alleging violations of California Proposition 65.
In February 2012, ThermoLife claimed in a lawsuit that MusclePharm infringed ThermoLife's patent on amino acid compounds including creatine nitrate.
In September 2011, it was reported that MusclePharm's executive vice president, Leonard Armenta, had resigned after accusations from the MMA fighter Quinton "Rampage" Jackson that there was a spy in his camp in the lead up to UFC 135. Jackson accused his opponent Jon Jones of having a spy at his training camp in Denver, Colorado, in the build up to the bout. In an interview with ESPN's SportsCenter, Jackson said MusclePharm released an employee named "Leonard" and accused him of acting as a spy for Jones.
In March 2012, NSF International notified the public that a MusclePharm product improperly bore the "NSF Certified for Sport" mark. In September 2012, The Tawnsaura Group sued MusclePharm for patent infringement.
In October 2012, MusclePharm discontinued use of BEAST Sports' trademarks including "Beast" and "Beast Mode" after MusclePharm’s unauthorized use.
In late 2013, MusclePharm announces it is under an official investigation by the SEC. One month later, it terminates its contract with Drew Ciccarelli.