Protector solar e oxybenzone

Mal menor ou maior?

https://www.dailymail.co.uk/health/article-6997513/Sunscreen-absorbed-blood-concentrations-419-TIMES-safe.html

Citando:
"Chemical oxybenzone reaches plasma concentrations of up to 209.6ng/mL 

Food and Drug Administration in the US recommends no more than 0.5ng/mL

Oxybenzone may also disrupt our hormones, leading to embryonic toxicities "
(...)
"To put this to the test, the researchers analysed the active ingredients - avobenzone, oxybenzone, octocrylene and ecamsule - of four commercially-available sunscreens. Brand names were not given. "

Os prazos dos protectores solares?

http://metro.co.uk/2017/06/26/does-sun-cream-have-an-expiry-date-6734638/

Citando:
"According to NHS Choices, sun cream has a shelf life of two to three years, so long as it’s not stored in direct sunlight or at high temperatures."

Se se deixarem os frascos ao sol a fórmula altera-se e os prazos alteram-se também. Por isso em caso de dúvida, compre-se todos os anos.

Novo composto protege contra UVA (mitoiron claw)

http://www.techtimes.com/articles/170872/20160722/new-sunscreen-compound-offers-cellular-level-protection-against-uva-rays.htm

Citando:
"Numerous sunscreens are available in the market today but most of them protect well only against UVB rays, leaving UVA protection limited. This is problematic because UVA rays penetrate deep into the skin, causing damage at the cellular level.

To address this issue, researchers have uncovered a compound that can be added to sunscreens that offers unexpectedly strong protection against UVA exposure, particularly within the cell where most of the damage related to UVA occurs.

Concentrations of free iron are highest within the mitochondria, the powerhouse of the cell. However, free iron turns into a catalyst for toxic reactive oxygen species when exposed to UVA, facilitating damage to cellular components that lead to increased risks of cancer and cell death.

The custom-designed iron chelator called mitoiron claw that the researchers developed attaches to iron atoms like a claw (hence its name), safely binding excess free iron and keeping them from reacting once exposed to UVA rays.

The researchers carried out tests involving human skin cells exposed to UVA at a rate equivalent to 140 minutes of uninterrupted sun exposure and saw that mitoiron claw-treated cells received complete protection against cell death."

Protectores solares para crianças?

Alguns protectores solares (para crianças) não protegem como deviam ou contêm produtos tóxicos:

http://www.techtimes.com/articles/208431/20170527/for-clarification-here-are-the-most-dangerous-sunscreens-for-your-kids.htm

O report:
2017 Guide to suncreens:
http://www.ewg.org/release/ewg-2017-guide-safer-more-effective-sunscreens

Citando:
"Among these sunscreens on the EWG's list, 12 were scored negatively because of three things: retinyl palmitate, oxybenzone, and an SPF level of over 50+. Five of them were placed on the list because of their spray format that do not provide a thick, even coating and potentially expose children's lungs to toxic chemicals, while two were scored negatively because apart from the questionable formulation, their labels also have a different SPF value compared to EWG's estimates.
(...)

HEALTH

Here Are The Most Dangerous Sunscreens For Your Kids

By Athena Chan | May 27, 2017 04:59 AM EDT

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Infants and children are more susceptible to sun damage. Placing SPF labels and hazardous ingredients into consideration, here is the EWG's list of the most dangerous sunscreens for your kids. (Photo : Joe Raedle | Getty Images)

Though sunscreens are a staple part of protecting our skin from prolonged sun exposure, experts are wary about mislabeled products or those with toxic ingredients, as well as the health hazards that come with them. Here are the top 14 worst sunscreens according to a report.

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2017 Guide To Sunscreens

Last May 23, the EWG released their 11^th annual guide to sunscreens. In the report, they also released information about the current sunscreens on the market. What they found was that almost three-fourths of sunscreens in the market either poorly protect the skin, or have toxic ingredients that can cause negative effects on more sensitive skin.

Along with the guide, the EWG also listed the sunscreens that are deemed as the worst scoring sunscreens for kids. The products they rated for this matter are only those that have the words "kids," "baby," "pediatric," "children," or "little" on their labels, and not those simply with images of children on their packaging.

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Further, they emphasize that the Food and Drug Administration does not have any additional requirements or even a set of criteria that would differentiate sunscreen products that are marketed for children.

Here is the list of the EWG's worst scoring sunscreen for children:

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• Banana Boat Kids Continuous Spray Sunscreen, SPF 100 (10)• Banana Boat Kids Sunscreen Lotion, SPF 100 (10)• Coppertone Foaming Lotion Sunscreen Kids Wacky Foam, SPF 70 (7)• Coppertone Sunscreen Continuous Spray Kids, SPF 70 (7)• Coppertone Sunscreen Lotion Kids, SPF 70 (7)• Coppertone Sunscreen Lotion Water Babies, SPF 70+ (7)

• Coppertone Sunscreen Stick Kids, SPF 55 (7)

• Coppertone Sunscreen Stick Water Babies, SPF 55 (7)

• Coppertone Sunscreen Water Babies Foaming Lotion, SPF 70 (7)

• CVS Health Children's Sunstick Sunscreen, SPF 55 (7)

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• Equate Baby Sunscreen Lotion, SPF 70 (7)

• Neutrogena Pure & Free Baby Sunscreen, SPF 60+ (10)

• Neutrogena Wet Skin Kids Sunscreen Spray, SPF 70+ (7)

• Up & Up Kids Sunscreen Sticks, SPF 55 (7)

Among these sunscreens on the EWG's list, 12 were scored negatively because of three things: retinyl palmitate, oxybenzone, and an SPF level of over 50+. Five of them were placed on the list because of their spray format that do not provide a thick, even coating and potentially expose children's lungs to toxic chemicals, while two were scored negatively because apart from the questionable formulation, their labels also have a different SPF value compared to EWG's estimates.

The Issue With Sunscreens

The question of the effectiveness and usefulness of sunscreen products revolve around a number of factors. For one thing, the EWG stresses that higher SPF ratings do not necessarily mean a better protection factor.

In fact, they state that the term is limited to UVB ray protection which only protects the skin against sunburn. The label does not extend to UVA rays which go deeper into the skin and speed up skin aging, cause skin cancer, and suppress the immune system.

What's more, the labels claiming to have higher SPF labels are likely misleading because due to the FDA's cap on the amount of active ingredients in a product, most sunscreens have essentially the same concentration of avobenzone, which is the main ingredient that is used to protect skin from UVA rays.

Essentially, what the EWG found is that many of the sunscreens in the market today can protect the skin from sunburns, but not from skin aging and possible melanoma.

Another problem with the use of sunscreens with higher SPF ratings is that they give people a false sense of security regarding the amount of sun exposure they have, leading them to stay under the sun for longer amounts of time.

Another matter of importance is the amount of potentially harmful ingredients in sunscreens. Forty percent of sunscreens in the market this year contain oxybenzone, an active ingredient in sunscreens that can penetrate the skin and into the bloodstream where it will act like a hormone disrupter and can cause allergic reactions. Also, retinyl palmitate, a form of vitamin A, may speed up the development of skin tumors and lesions on sun-exposed skin."

Sobre protectores solares

... E o facto de alguns não terem o nível de protecção que anunciam na etiqueta:
http://www.consumerreports.org/sunscreens/get-the-best-sun-protection/
http://greatist.com/live/sunscreens-that-are-lying-about-their-spf