Zinc Oxide
Definition
Zinc oxide is a mineral (inorganic) sunscreen ingredient that provides broad-spectrum protection against both UVA and UVB rays. Unlike chemical sunscreen filters that absorb UV radiation, zinc oxide works by sitting on the skin's surface and physically reflecting and scattering UV light away from the skin. It is one of only two mineral sunscreen ingredients approved by the FDA (the other being titanium dioxide) and is considered the safest sunscreen active by the Environmental Working Group (EWG). Zinc oxide is particularly beneficial for sensitive skin, acne-prone skin, and conditions like rosacea because it is non-irritating and has mild anti-inflammatory properties. Historically, zinc oxide sunscreens left a noticeable white cast on the skin, but modern micronized and nano-formulations have significantly reduced this effect, though some white cast may still be visible, especially on darker skin tones. Zinc oxide is also reef-safe, making it an environmentally conscious choice.
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