Does Zinc oxide sunscreen block all UVA? ?
Does zinc oxide sunblock block every UVA ray you come in contact with or is it not true and some still get through ??
- dLv 62 months ago
In its non-micronized form, zinc oxide is one of the broadest spectrum sunscreen filters available, blocking the entire UVB and UVA range, as well as visible light up to wavelengths of 700 nm.
Zinc nanoparticles block only up to 380-400 nm, depending on the formulation, which is the top end of the long wavelength UVA range, but does not filter visible light.
Hope this helps.