Sunscreen (also known as sunblock, suncream, suntan lotion) is a lotion, spray or other topical products that helps protect the skin from the sun's ultraviolet radiation, and which reduces sunburn and other skin damage, ultimately leading to a lower risk of skin cancer.
The best sunscreens protect against both UVB (ultraviolet radiation with wavelength between 290 and 320 nanometres), which can cause sunburn, and UVA (between 320 and 400 nanometres), which damages the skin with more long-term effects, such as premature skin aging. Most sunscreens work by containing either an organic chemical compound that absorbs ultraviolet light ( such as oxybenzone) or an opaque material that reflects light (such as titanium dioxide, zinc oxide), or a combination of both. Typically, absorptive materials are referred to as chemical blocks, whereas opaque materials are mineral or physical blocks.
Many people apply sunscreen when participating in outdoor activities during the summer. However, experts suggest wearing sunscreen throughout the year to prevent cumulative damage from UVA rays, which are prevalent through the year, and to lower the risk of skin cancer. It is recommended that sunscreen be applied 30 minutes before exposure to the sun. Sunblock and sunscreen should also be used as just one form of protection from the sun. Care should be taken to always avoid the sun between the hours of 10 and 2, when the sun's rays are the strongest; it is also notable that some experts suggest between 10 and 4. Protective clothing, such as wide-brimmed hats, UV 400 sunglasses, and tightly woven clothes with long sleeves and long pants should be worn. Because about 50 % of the sun's rays can stream through windows, including those in the car, some dermatologists and skin experts have a UV shield applied to their car windows, which can shield as much as 99% of the sun's harmful rays. Sunscreen should therefore be considered only one defense against the sun, and used in conjunction with other methods.
A significant reduction in sun exposure inhibits the production of vitamin D. Though excessive sun exposure has been conclusively linked to some forms of skin cancer and signs of premature aging, there is some evidence that vitamin D may help prevent other forms of cancer. Season, geographic latitude, time of day, cloud cover, smog, skin type, and sunscreen all have an effect on vitamin D production in the skin, but fifteen minutes per day of direct exposure to the sun is a generally accepted guideline to follow for optimum vitamin D production. Experts generally recommend taking a fifteen minute walk in the morning or evening without wearing sunscreen to meet this requirement.
Sun Facts
.Snow, sand, water, concrete and glass reflect sunlight.
.Clouds do not protect you from the damaging UV rays.
.The higher the altitude the more intense the sun (6% every 1000 feet).
.The sun damages your eyes, increasing the risk of cataracts, macular degeneration, and eyelid cancers.
.The sun's UV rays can penetrate many types of clothing.
.Dry, dehydrated skin burns more easily than well hydrated skin.
Sun Tips
.Protect newborns from the sun
.Wear a hat to protect your scalp
.Apply sunblock to your ears
.Use non-toxic mineral sunblocks
.Use a self tanner to achieve the desired tan look
.Do not use Rentin-A when you are planning on spending time in the sun.
Alternative Medicine Direct
The best sunscreens protect against both UVB (ultraviolet radiation with wavelength between 290 and 320 nanometres), which can cause sunburn, and UVA (between 320 and 400 nanometres), which damages the skin with more long-term effects, such as premature skin aging. Most sunscreens work by containing either an organic chemical compound that absorbs ultraviolet light ( such as oxybenzone) or an opaque material that reflects light (such as titanium dioxide, zinc oxide), or a combination of both. Typically, absorptive materials are referred to as chemical blocks, whereas opaque materials are mineral or physical blocks.
Many people apply sunscreen when participating in outdoor activities during the summer. However, experts suggest wearing sunscreen throughout the year to prevent cumulative damage from UVA rays, which are prevalent through the year, and to lower the risk of skin cancer. It is recommended that sunscreen be applied 30 minutes before exposure to the sun. Sunblock and sunscreen should also be used as just one form of protection from the sun. Care should be taken to always avoid the sun between the hours of 10 and 2, when the sun's rays are the strongest; it is also notable that some experts suggest between 10 and 4. Protective clothing, such as wide-brimmed hats, UV 400 sunglasses, and tightly woven clothes with long sleeves and long pants should be worn. Because about 50 % of the sun's rays can stream through windows, including those in the car, some dermatologists and skin experts have a UV shield applied to their car windows, which can shield as much as 99% of the sun's harmful rays. Sunscreen should therefore be considered only one defense against the sun, and used in conjunction with other methods.
A significant reduction in sun exposure inhibits the production of vitamin D. Though excessive sun exposure has been conclusively linked to some forms of skin cancer and signs of premature aging, there is some evidence that vitamin D may help prevent other forms of cancer. Season, geographic latitude, time of day, cloud cover, smog, skin type, and sunscreen all have an effect on vitamin D production in the skin, but fifteen minutes per day of direct exposure to the sun is a generally accepted guideline to follow for optimum vitamin D production. Experts generally recommend taking a fifteen minute walk in the morning or evening without wearing sunscreen to meet this requirement.
Sun Facts
.Snow, sand, water, concrete and glass reflect sunlight.
.Clouds do not protect you from the damaging UV rays.
.The higher the altitude the more intense the sun (6% every 1000 feet).
.The sun damages your eyes, increasing the risk of cataracts, macular degeneration, and eyelid cancers.
.The sun's UV rays can penetrate many types of clothing.
.Dry, dehydrated skin burns more easily than well hydrated skin.
Sun Tips
.Protect newborns from the sun
.Wear a hat to protect your scalp
.Apply sunblock to your ears
.Use non-toxic mineral sunblocks
.Use a self tanner to achieve the desired tan look
.Do not use Rentin-A when you are planning on spending time in the sun.
Alternative Medicine Direct
good facts
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