Zinc oxide in sunscreen: what Cleveland Clinic says about mineral sunscreen

Reviewed October 17, 2026

The short answer

Zinc oxide is one of two active ingredients Cleveland Clinic names for mineral sunscreen; the other is titanium dioxide. Cleveland Clinic says these minerals sit on the skin and reflect and scatter ultraviolet light, and that the best sunscreen is the one you will actually use.

How it works

A dermatology resident quoted by Cleveland Clinic says mineral sunscreens guard the skin by reflecting UV light. Chemical sunscreens, by contrast, absorb it. Cleveland Clinic lists avobenzone, oxybenzone and octinoxate as examples of chemical filters.

Trade-offs the source lists

• Cleveland Clinic: mineral sunscreens usually go on opaque, and they work as soon as they are applied.
• Cleveland Clinic: sensitive skin generally copes with them, and they pose a smaller risk of irritation or allergy than chemical ones. It also says they are a better fit for skin that is oily or breakout-prone because pores are less apt to get blocked.
• Cleveland Clinic: they can feel thick, be harder to spread and leave a white cast, which may show more on darker skin tones, though some newer formulas try to reduce it.
• Cleveland Clinic: chemical sunscreens often resist water better and are usually see-through, but carry a higher chance of allergic reactions and need about 20 minutes before they are effective.

What it says about safety

Cleveland Clinic notes a 2019 study that found the active chemicals in some sunscreens can enter the bloodstream and may bring side effects, rashes among them. It adds that the FDA regarded the two main mineral ingredients as safe in 2019. It also says that either kind can be a better choice than going without sunscreen, and suggests checking with a dermatologist or other clinician if you wonder how an ingredient may affect you.

How to read it on a label

US cosmetic labels generally list ingredients in descending order of amount, but anything at 1% or less can appear in any order after those above 1%. Its position does not tell you the exact concentration. Judge the whole product, how it feels on your skin, and what changes when you add or drop it.

What not to conclude

This page does not say zinc oxide products protect better than other sunscreens, and it cannot tell you a product's SPF or how much to apply. Cleveland Clinic frames the choice as a matter of preference and tolerance. If a product irritates your skin, stop using it and ask a dermatologist.