Zinc oxide is a natural mineral which has been used safely for generations to shield against the harmful effects of the sun. Zinc oxide forms a protective physical barrier over the skin and stops the harmful UV rays, providing the most complete protection. Because it absorbs ultraviolet light, zinc oxide can be used in ointments, creams, and lotions to protect against sunburn. Some ointment-based preparations such as zinc oxide are water repellent and stay on even during swimming. Zinc oxide is ideal for the nose and ears while swimming. A deodorant can be made simply from zinc oxide which works by killing underarm bacteria so they won't smell. You can also use it as a diaper rash ointment or on your nose as a complete sun block. Just add water to desired consistency. Zinc oxide is the main active ingredient in Desitin Diaper Rash Ointment. Ours is not micronized.