The facts about sun block. How much SPF do you really need?
August 29th, 2008
Many sun protection products rave about their high SPFs of 50, 70 and 80. But is it really necessary to go that high? Of course any protection is better than no protection, but know the SPF facts before you decide.
To prevent premature aging, skin cancer, or sun damaged skin (for example melasma) even a sun block of SPF 5 is better than nothing, but dermatologists recommend a product with full-spectrum coverage with at least an SPF of 15.
There are two types of sun rays to differentiate: ultraviolet-a (UVA) and ultraviolet-b (UVB). UVA are longer wavelengths from the sun and penetrate deeper into the skin and may be the culprit behind aging. UVB rays have shorter wavelengths and are more likely to cause sun burn and skin cancer.
Products that contain SPF (SPF stands for sun protection factor) only protect the skin from UVB rays so it’s important to use a block that is UVA/UVB or broad-spectrum protection.
Technically, SPF represents the amount of time it takes for the skin to redden. For example, with an SPF 15 it will take about five hours for your skin to begin burning while without it the skin will redden within 20 minutes. The higher the SPF the longer it takes for your skin to redden.
Here’s the breakdown on UVB protection
• SPF 15 blocks 93 percent
• SPF 30 blocks 97 percent
• SPF 50 blocks 99 percent
Anything above SPF 50 will provide only a negligible amount of UVB protection.
Just because you apply once in the morning doesn’t mean you are covered at 4pm that afternoon. Make sure to reapply every couple of hours especially if you are in the water or sweating. Most sun blocks will last you two hours.
Skin Fitness Facts recommends a number of full-spectrum sun block products including DDF’s Daily Organic.
This entry was posted on Friday, August 29th, 2008 at 4:39 pm and is filed under Melasma, Products, Skin Cancer, Total Skin Fitness. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
December 14th, 2008 at 8:38 pm
You are welcome.
January 13th, 2010 at 6:17 pm
SPF 30 is recommended.
April 4th, 2010 at 11:37 am
Anything above SPF 50 is not negligible. A new study showed that Spf 85 was more significantly more effective than SPF 50.
Source: Lecture from board-certified dermatologist last week.
June 20th, 2010 at 2:24 am
Sunblocks can also reduce the incidence of skin cancer by preventing UV to harm your skin.:-’
July 29th, 2010 at 11:34 am
you can reduce the risk of skin cancer buy using sunblocks if you are going to get prolonged exposure to the sun .’.
August 1st, 2010 at 10:29 am
if you want to avoid getting skin cancer, sun protection is a necessitiy;’;
August 17th, 2010 at 3:01 pm
I found out that the skin protection is very important. I use SpF 30 from Blue Lizard company as i found them very good.
With 2 children the sun protection is very important and i m really fond of sun protection products from their company.
September 27th, 2010 at 10:00 pm
skin cancer is rarer than colon cancer but just as deadly.`.
September 28th, 2010 at 12:06 am
i always use sun protection because i am afraid to get skin cancer-.-
October 13th, 2010 at 12:13 pm
some topical vitamins like B5 also provides Sun protection, -;,
October 13th, 2010 at 1:18 pm
skin cancer is preventable, just use sunblock and also take lots of anti-oxidants-”
October 25th, 2010 at 2:05 am
skin cancer is usually caused by UV exposure, therefore, it really makes sense to always use those UV block creams when going o;,`
October 25th, 2010 at 3:01 am
as always, sun protection should never be neglegted because it helps UV damage of your skin’.`
December 22nd, 2010 at 1:19 pm
well, skin cancer incidence would be increasing because of the hole on the ozone layer -.’
July 5th, 2011 at 10:29 pm
sun protection is always necessary in countries where the sun is trong. uv radiation from the sun can really cause cancer.’
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