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The AAD recommends using a broad-spectrum sunscreen — meaning it protects against both UVA rays (which prematurely age skin) and UVB rays (which cause sunburn) — with SPF 30 or higher.
I always recommend a SPF level at or around an SPF 50, as that's the magical number where you are maximizing your UVB protection while using a formulation that is easy enough to rub in and will ...
SPF is, therefore, also called UVB-PF, for "UVB protection factor". [73] This rating, however, offers no data about important protection against UVA, [74] which does not primarily cause sunburn but is still harmful, since it causes indirect DNA damage and is also considered carcinogenic. Several studies suggest that the absence of UVA filters ...
Water-resistant sunscreens were introduced in 1977, [20] and recent development efforts have focused on overcoming later concerns by making sunscreen protection both longer-lasting and broader-spectrum (protection from both UVA & UVB rays), more environmentally friendly, [31] more appealing to use [24] and addressing the safety concerns of ...
The label should include “broad spectrum” to indicate protection against UVA and UVB rays. SPF 30 or greater. Made for sensitive skin, and is fragrance-free.
The UV index is a number linearly related to the intensity of sunburn-producing UV radiation at a given point on the Earth's surface. It cannot be simply related to the irradiance (measured in W / m 2 ) because the UV of greatest concern occupies a spectrum of wavelengths from 295 to 325 nm, and shorter wavelengths have already been absorbed a ...
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