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UPF (ultraviolet protection factor) represents the ratio of sunburn-causing UV without and with the protection of the fabric, similar to SPF (sun protection factor) ratings for sunscreen. While standard summer fabrics have UPF ~6, sun protective clothing typically has UPF ~30, which means that only 1 out of ~30 units of UV will pass through (~3%).
High-SPF sunscreens filter out most UVB radiation, which triggers vitamin D production in the skin. However, clinical studies show that regular sunscreen use does not lead to vitamin D deficiency. Even high-SPF sunscreens allow a small amount of UVB to reach the skin, sufficient for vitamin D synthesis.
As SPF levels increase beyond 50, the formulations tend to be thicker and leave a chalkier appearance, and most people will under compensate that white chalkiness by not utilizing the right amount ...
According to the MD Anderson Cancer Center, an SPF 15 sunscreen blocks 93% of the sun’s harmful UVB rays, and SPF 30 blocks 97%. Once you get higher than that, you’re only getting a small ...
For clothing, the ultraviolet protection factor (UPF) represents the ratio of sunburn-causing UV without and with the protection of the fabric, similar to sun protection factor (SPF) ratings for sunscreen. [citation needed] Standard summer fabrics have UPFs around 6, which means that about 20% of UV will pass through. [citation needed]
The FDA, which regulates sunscreen as a nonprescription drug, asked sunscreen makers in 2019 and again in 2021, to provide more safety data on 12 common ingredients so that they can have GRASE ...
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