The main application is as flame retardant synergist in combination with halogenated materials. It is characterized as an insect repellent, insecticide, and pesticide synergist. "Synergist" muscles perform, or help perform, the same set of joint motion as the agonists. Broadly, a synergist is an entity that displays synergy with respect to another entity. Lutheranism, however, confesses a monergist salvation and synergist damnation (see below). Was Kierkegaard a Monergist or a Synergist? There is an important difference between a helping synergist muscle and a true synergist muscle. For muscle coactivation to occur, both the muscle and synergist muscle need to contract.