In this paper we review selected international legal instruments, the effect, if any, that they have had on global health, and how these instruments might have contributed to the realization of health rights. We consider a number of instruments from the international health law field as well as two from the field of international environmental law.1 The latter two, in addition to the considerable link between health and climate/environment, are considered with the purpose of drawing more generalized lessons about what (...) contributes to the success or failure of an international legal instrument; the lessons are then applied to our analysis of the health law instruments that are the primary focus of our paper. (shrink)