The new era of mobile technologies has revolutionized all fundamental human pursuits in that many sectors have been reshaped and tangibly improved, such as education, finance, and healthcare. Referred to as mHealth, the use of mobile technologies to track and improve health outcomes is a rapidly expanding trend. A plethora of mobile health applications (mHealth apps) are being constantly developed thanks to the rapid adoption of mobile devices. From basic exercise trackers to powerful self-management tools, mHealth apps play several roles towards the provision of better healthcare. To induce playful experiences and boost engagement, gamification has proven to be extremely effective with mHealth apps. This paper presents a catalog of reusable requirements for gamified mHealth apps in terms of gamification, functional suitability, usability, and security, Further improvements are intended to be made continuously to the catalog by adding additional requirements scattered from other standards and information sources.