The first clinical trial to test whether adults with peanut allergies can be desensitized has shown great success—with two-thirds of participants able to consume the equivalent of five peanuts at the end of the study without reacting.

Known as oral immunotherapy, the approach has been successful in infants and children worldwide, but this first-of-its-kind study—the Grown Up Peanut Immunotherapy trial—shows adults can benefit too.