Fitness Influencer Accused of Breaking ‘Blood-Signed’ Deal Over MOFO Supplement

A polarizing fitness personality widely known as “Liver King” is embroiled in a peculiar legal fight over a men’s supplement—and an agreement that was allegedly signed with blood. The dispute is colorful, if nothing else, and centers on who came up with what, who promised whom, and whether any of it ever held legal weight.

According to a complaint filed by athlete and health influencer Brad Kearns, he and Brian Johnson discussed launching a product called “Male Optimization Formula with Organs,” or MOFO. To formalize their understanding, Kearns says a short, one-page agreement was created—and, at Johnson’s insistence, marked with their blood.

Johnson’s legal response disputes key parts of that story. His team says they never received an official pitch from Kearns and had no real interest in the MOFO name. Yet, notably, they do not contest that an agreement exists or that it contains blood markings.

Whether dramatic or merely theatrical, a “blood oath” doesn’t transform a document into a binding contract. Courts have found that agreements written in or marked with blood aren’t legally enforceable on that basis alone; at best, the flourish is symbolic. That context makes the alleged ritual more spectacle than substance.

This skirmish arrives against a broader backdrop for Johnson, who has faced separate legal claims from followers alleging he misled them about his “ancestral” lifestyle and the origins of his physique—especially after disclosures of steroid use. Taken together, it’s little surprise that skeptics question how much weight any supposed “blood-bound” promise ever had.

At the end of the day, the stain may linger, but the law cares more about clear terms than dramatic gestures. If there’s a lesson here, it’s that airtight paperwork beats performance art—every time.