Nanoparticles are small particles sized between 1 to 100 nm. They possess diverse properties because of their high surface area compared to their size and quantum effects, which makes them suitable for a variety of applications. Nanoparticles offer promising features and mechanisms for nutrient delivery that makes them capable of improving absorptionAbsorption and customised delivery, enabling controlled and sustained energy release, muscle regenerationMuscle regeneration, all of these leading to better athletic performanceAthletic performance. The mechanics underlying these particles are thoroughly examined in this chapter, including nutritional absorptionAbsorption, cellular uptakeCellular uptake mechanisms, and anti-inflammatory actions. Ethical issues, regulatory requirements, and healthHealth implications are also discussed, emphasising the importance of proper safety practices and quality control. The constraints of accessibility, cost and public awareness as well as the prospective developmentDevelopment of personalised Nano-nutrition based on genetic profiles are addressed. Collaborative research is required between sports scientists and nanotechnology specialists to guarantee safe and equitable nanoparticle inclusion in sports nutrition. As research develops, nanoparticles are set to become a fundamental element of sports nutrition that provides athletes an effective and ethical tool for long-term performance enhancementPerformance enhancement. This chapter explores what nanoparticles can bring to sports nutrition, focusing more on their potential to unlock the peak athletic performanceAthletic performance.