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sun block

A chemical preparation, such as zinc oxide, that is applied to the skin to protect it from the ultraviolet rays of the sun.


Public health An opaque substance, usually formulated from zinc or titanium oxides, designed to completely prevent solar radiation from reaching the skin. See SPF rating. Cf Sunscreen.

Patient discussion about sunblock

Q. what does a sun block cream do? and what are a UV rays?

A. It blocks out harmful Ultra violet rays from the skin as the previous entries have related; however it can also block your ability to produce vitamin D. If you live in a northerly area or one that receives limited sunlight, its recommended to get at least 15 minutes of sun a day (this is probably best done with minimal sunblock) and according to personnal sun sensitivity. Another thing to keep in mind is that sunblock works best if applied 20 minutes before sun exposure.

More discussions about sunblock
References in periodicals archive ?
This risk is increased even more for those who do not use sunblock regularly," said Dr Sahar Al Nowais, specialist dermatologist at the Mafraq Hospital in the capital.
Still, taking daily precautions in addition to diligent sunblock use is always key.
We're rooting for Murad's Oil-Free Sunblock SPF 15 for Face in Sheer Tint ($22, murad.
McKelvie told investigators he put sunblock on the boy,but the indictment said he failed ``to apply enough'' and that the boy suffered large,bleeding blisters to his skin.
Youngsters who visit them at Whitehouse Farm Centre in Morpeth are being asked to bring spare supplies of sunblock.
If used properly, sunblock is very effective at preventing the harmful effects of the sun that may lead to both skin cancer and accelerated aging," warns Sarah Weitzul, assistant professor of dermatology at the University of Texas Southwestern Medical Center at Dallas.
But neither sunscreen nor sunblock is 100 percent effective, so it's important to also protect your skin with hats, sunglasses, clothing, and umbrellas.
which pulls double duty as SPF 15 sunblock, and the tick-and-insect repellent Swy Flotter ($8, 4 oz.
Though I had hoped the folks at CBS might drop the Bush and Gore legal teams into the Australian outback to fight over sunblock and locusts, it looks like fans of last summer's surprise hit will once again be watching 16 fairly ordinary humans battle and betray one another in hopes of winning a pot of gold the size of Ayer's Rock.
A Phototoxicity Center to study cosmetic chemicals and additives, sunblock additives, tanning enhancers, skin colorants, and tattoo inks
using a sunblock with an SPF (sun protection factor) of at least 15 year-round.
However, in 21 nests where researchers eliminated the UV cue by smearing the male's crest with sunblock, the previously attractive birds did not have extra sons.