There is an urgent need to address healthcare challenges and an increasing demand for innovative solutions to power ingestible and implantable devices. This book systematically explores the potential of energy materials to be a catalyst in this research and to act as a power bank for biomedical devices, with a focus on ingestible or implantable technologies. Coverage includes elucidating current developments, addressing challenges, proposing solutions and charting future possibilities, all ultimately with the aim of fostering a collective effort towards progress in this critical area of healthcare technology. Aimed at researchers who require an up-to-date overview of the status and challenges for energy materials in healthcare, it summarizes ongoing efforts and highlights the untapped potential. This valuable resource not only updates them on the existing landscape but also serves as a source of inspiration, encouraging further exploration and contribution to the progress of energy materials in healthcare.