Zinc oxide

Zinc oxide particles mostly absorb UV radiation, and to a lesser degree scatter and reflect it. Unlike most single organic filters, it covers UVA1 out to about 380 nm, so it can provide broad-spectrum protection on its own at higher concentrations. Smaller particles reduce the white cast; tinted formulas with iron oxides also help with visible light. It is also an FDA skin protectant used in diaper and barrier creams.

In our directory: It’s a key ingredient in 3 products we review, most often sunscreen and complexion. Those products are mostly built for uv protection, redness and irritation-free. In formulas, it most often shares the label with niacinamide, hyaluronic acid and squalane.

Apply generously as the last skincare step, about 1/4 teaspoon for the face and neck, at least 15 minutes before sun exposure; reapply every two hours and after swimming or sweating.

References

1. 1A review of inorganic UV filters zinc oxide and titanium dioxide — Photodermatology, Photoimmunology & Photomedicine (2019), via PubMed
2. 2Questions and Answers: FDA's regulatory actions on over-the-counter sunscreen — U.S. Food and Drug Administration
3. 3Sunscreen FAQs — American Academy of Dermatology

Educational, not medical advice. Ingredient guides summarise published research and expert guidance; formulas and concentrations differ between products.