Upconversion nanoparticles demonstrate unique optical properties, making them attractive for applications in bioimaging, sensing, and therapy. However, their potential toxicity remains a considerable concern. This review aims to provide a in-depth analysis of the toxicity linked with upconversion nanoparticles. It examines various aspects, includin

Zinc oxide is a compound renowned for its remarkable strength to safeguard delicate skin. This calming ingredient has long been utilized in a range of skincare products, from sunscreens to diaper rash creams, due to its exceptional protective characteristics. Forming a physical barrier on the skin's exterior, zinc oxide effectively absorbs harmfu