As a wide variety of state regulations allegedly aimed at protecting public health may interfere with foreign investments, a tension exists between the public health policies of the host state and investment treaty provisions. Under most investment treaties, States have waived their sovereign immunity, and have agreed to give arbitrators a comprehensive jurisdiction over what are essentially regulatory disputes. Some scholars and practitioners have expressed concern regarding the magnitude of decision-making power allocated to investment treaty tribunals. This book contributes to the current understanding of international investment law and arbitration, addressing the fundamental question of whether public health has and/or should have any relevance in contemporary international investment law and policy.