Upconversion nanoparticles exhibit unique optical properties, making them attractive for applications in bioimaging, sensing, and therapy. However, their potential toxicity remains a significant concern. This review aims to provide a in-depth analysis of the toxicity connected with upconversion nanoparticles. It investigates various aspects, includ

Zinc oxide is a compound renowned for its remarkable ability to protect delicate skin. This gentle ingredient has long been used in a range of skincare products, from sunscreens to diaper rash creams, due to its outstanding protective properties. Establishing a physical barrier on the skin's surface, zinc oxide effectively blocks harmful sunlight