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Zinc oxide is photostable and covers both UVA and UVB.
Zinc oxide provides broad UVA and UVB coverage and is photostable, meaning it does not break down meaningfully in sunlight the way some organic filters can. It sits on the skin surface rather than absorbing, which is why mineral formulas can leave a cast and why they are often chosen for reactive skin.
Dermasift analyses skincare formulations against published cosmetic science. This is information, not medical advice — for a diagnosed skin condition, speak to a dermatologist.