|
I love summer time! The longer days, the BBQs, swimming, bon
fires, and of course the heat! But as my fellow fair-skin, freckle faced
friends know- - summer time means sun burns. And sun burns can lead to melanoma,
or skin cancer. Sun block can help reduce your risk of skin cancer, but
recently there has been a lot of news about the effectiveness and safety of sun
block. We all know that getting some sun and fresh air is good for us, but it's
better to play it safe when it comes to the sun.

Image
Credit:etoncorp.com
What is Sun Protection?
Sun protection is the general term given to the lotions,
sprays, and powders that guard our body on the adverse effects of sunlight. The
ultraviolet radiation that comes from the sun can be broken down into three
rays: UVA, UVB, and UVC. UVC rays don't get through the atmosphere, but UVA and
UVB rays are known to cause cells to age as well as cause damage to cells' DNA.
Exposure to UV rays for any length of time can cause wrinkles, burns, and
precancerous changes in the skin. Sunscreen is any substance or material that
protects the skin from this UV radiation.
You probably have noticed that each bottle of sunscreen,
as well as many lip balms, body lotions, and cosmetics have an SPF listed on
their container. SPF stands for "sun-protection factor", and is usually a
number such as 15, 30, or 50. This number indicates the degree of sunburn
protection provided by the sunscreen and is related to the total amount of sun
exposure rather than the length of the time in the sun. SPF does not measure
protection against UVA radiation.

Image Credit: Environmental
Working Group
How does Sunscreen Work?
The active ingredients in sunscreen absorb, reflect or
scatter UV radiation. The combination of different chemicals changes how the
body responds to this radiation. Initially manufacturers only created sunscreen
that was effective at screening out UVB radiation since it was known to cause
sunburn and increase the risk of skin cancer. With more recent studies showing
that UVA rays also play a role in the development of skin cancer, more
manufacturers are taking measures to create UVB and UVA sunscreen protection.
The most active ingredient in a sunscreen is either zinc
oxide or titanium dioxide. Both protect against UVA and UVB rays. Zinc oxide is
the preferred ingredient because it blocks more UV radiation. These inorganic
products are responsible for reflecting or scattering the UV radiation. Organic
materials such as octyl methoxycinnamate (OMC) or oxybenzone absorb UV
radiation dissipating it as heat. For more information, watch this video on
literally the coolest professor ever explaining how sunscreen works.
Zinc oxide and titanium
dioxide are stable compounds that provide broad spectrum UVA and UVB
protection. If the sunscreen isn't white on your skin than it is likely that
the compounds are nanoparticles in the sunscreen. Nanoparticles are growing in
popularity in sunscreens because of a consumers' desire for clear sunscreens,
and because smaller particles have a greater SPF efficacy.

Image
Credit:wellandgoodnyc.com
Which Sunscreen is best?
The Environmental Working Group (EWG) has released a new
edition of their sunscreen guide which evaluates over 1000 sunscreens for
safety and effectiveness. The guidelines that the EWG group used when assessing
the sunscreens include:
-
Safety of listed ingredients
-
UVB protection (using SPF (Sun Protection
Factor) rating as the indicator of effectiveness)
-
UVA protection (using a standard industry
absorbance model)
-
The balance of UVA/UVB protection (using ratio
of UVA absorbance to SPF)
-
Stability of the ingredients before they begin
to breakdown.
The full assessment methodology can be found that EWG
website.
The top three sunscreens were Kiss My Face Natural
Mineral Sunscreen with Hydresia SPF40, Loving Naturals Clear Body Sunscreen
SPF30+, and Loving Naturals Sunscreen stick SPF 30+.
Listed on the EWGs
hall of shame include Banana Boat Kids Quik Blok Spray Lotion and
Coppertone Water Babies Sunscreen Lotion. Both contain oxybenzone, a synthetic
chemical that penetrates the skin, potentially causing allergic reactions and
disrupting the body's natural hormones. The EWG also recommends that you avoid
sprays or powders due to the danger of inhaling the chemicals (and
nanoparticles) that comprise the sunscreen. Starting in December 2012, FDA
rules will bar sunscreen labels from using the terms "sweatproof", "sunblock",
and "waterproof" as well as restricting SPF ratings to no higher than "SPF 50+"
(since there is no evidence that anything higher is more effective) and making
products that advertise "broad spectrum protection" pass an FDA test. There is
still some concern that even the new FDA regulations aren't
strict enough to ensure people have the best skin protection, especially
since many US sunscreens would not be sold in Europe where the regulations are
much stricter.
There are still many
controversies surrounding the new FDA regulations and the EWG report. But
all that aside, for best results and the best protection, the American
Cancer Society recommends that sunscreen be applied liberally (use about a
handful) to all skin exposed to the sun. They also recommend that it be reapplied
every two hours, and after sweating and swimming. So be safe and have some fun
in the sun this summer!
Babies are happier with sunscreen! (You
didn't think I would forget to include a baby did you?:)!) Image Credit: webmd.com
Resources
How does
sunscreen work?
Sun
Protection and Sunscreens
Sunscreens:
How it works, What it means
|
"Almost" Good Answers: