Patrick Arnold

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Patrick Arnold (July 10, 1966 – May 12, 2026) was 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 Arnold manufactured (norbolethone and desoxymethyltestosterone (DMT)), not banned at the time of their creation, were hard-to-detect drugs at the heart of the BALCO professional sports doping scandal. BALCO distributed these worldwide to world-class athletes in a wide variety of sports ranging from track and field to professional baseball and football. Arnold also reintroduced methylhexanamine into the market as a dietary supplement under the mark Geranamine, a substance that has gained popularity. He was also an amateur bodybuilder, initially gaining notoriety as "the Father of Prohormones."