In 1998, 4Life Founders David and Bianca Lisonbee launched the company’s flagship immune system support product, 4Life Transfer Factor®. As the first network marketing company to do so, 4Life’s leading group of doctors, scientists, and researchers continue to advance immune system science with innovations in product formulation, production standards, delivery methods, and more. Today, people in more than 50 countries enjoy the immune system support of 4Life products.