The Health Data Safe is a non-profit initiative aimed first at protecting health data; and second at providing services from the data of women using fertility awareness-based methods (FABM). The HDS will create the first interdisciplinary data platform which is interoperable with all existing tools managing feminine cycle data, making it easy and secure to use. The platform will give users complete control over the use of their data either to improve their personal health or for medical research validated by an ethical committee, over which they will be able to control their participation at any time. With this tool, the partners, anchored in a Hippocratic vision of medicine, will be able to considerably accelerate medical research on the feminine cycle, and make available to all, innovative solutions for women's health and knowledge of the feminine cycle