Patrick Arnold is an American organic chemist known for introducing androstenedione, 1-Androstenediol, and methylhexanamine into the dietary supplement market, and for creating the designer steroid tetrahydrogestrinone, also known as THG and "the clear". THG, along with two other anabolic steroids that Patrick Arnold manufactured (norbolethone and desoxymethyltestosterone (DMT), were drugs at the heart of the BALCO professional sports doping scandal. At the time of their creation, they were not on any banned substance list. BALCO distributed these worldwide to world class athletes from a wide variety of sports ranging from track and field to professional baseball and football.Patrick Arnold also reintroduced methylhexanamine into the market as a dietary supplement under the mark Geranamine, a substance that has gained popularity.Arnold, who is also an amateur bodybuilder, initially gained notoriety as "the Father of Prohormones."