“Mineral sunscreens contain the minerals titanium dioxide and zinc oxide,” says Dr Kemi Fabusiwa, skin specialist and founder of Joyful Skin Clinic previously told Refinery29. “These two mineral ingredients sit on the surface of skin, reflecting the UV rays and preventing them from penetrating deep into the skin.” (Mineral sunscreens are also called “physical” sunscreens because they create a physical barrier between your skin and UV rays, while chemical actives work by absorbing rays.) According to Dr. Fabuwisa, chemical sunscreens have the potential to be more irritating, especially for those with sensitive, acneic, or allergy-prone skin.