Upconversion nanoparticles demonstrate unique optical properties, making them attractive for applications in bioimaging, sensing, and medical treatments. However, their potential toxicity remains a significant concern. This review aims to provide a comprehensive analysis of the toxicity linked with upconversion nanoparticles. It examines various as

Zinc oxide is a compound renowned for its remarkable ability to safeguard delicate skin. This gentle ingredient has long been employed in a variety of skincare products, from sunscreens to diaper rash creams, due to its remarkable protective properties. Creating a physical barrier on the skin's top layer, zinc oxide effectively absorbs harmful su