Nano Sunscreen

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With all of this possible damage, it pays to wear sunscreen, but which one should you use?

Source: http://www.niehs.nih.gov/oc/factsheets/genes/home.htm

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Which Sunscreen Should You Use???

New and Improved

Now with Nano-Z

SPF 50

Goes on Clear

Safe for Children

Broadband Protection

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The Challenge: 3 Essential Questions

What are the most important factors to consider in choosing a sunscreen?

How do you know if a sunscreen has “nano” ingredients?

How do “nano” sunscreen ingredients differ from other ingredients currently used in sunscreens?

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Sources: http://www.bbc.co.uk/wiltshire/content/articles/2005/05/05/peoples_war_feature.shtml

http://www.arpansa.gov.au/is_sunys.htm

A Brief History of Sunscreens: The Beginning

First developed for soldiers in WWII (1940s) to block “sunburn causing rays”

Shorter wavelengths (more energy) called UVC

Longer wavelengths (less energy) called UVA

These were called UVB rays

WWII soldier in the sun

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Sources: http://www.shop.beautysurg.com/ProductImages/skincare/14521.jpg and http://www.shop.beautysurg.com/ProductImages/skincare/14520.jpg

A Brief History of Sunscreens: The SPF Rating

SPF (Sunscreen Protection Factor) Number

Measures the strength of UVB protection only

Higher SPF # = more protection from UVB

Doesn’t tell you anything about protection from UVA

Sunscreens first developed to prevent sunburn

Ingredients were good UVB blockers

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A Brief History of Sunscreens: The UVA Problem

UVA rays have no immediate visible effects but cause serious long term damage

Cancer

Skin aging

Sunscreen makers working to find UVA blockers

No official rating of UVA protection yet

Source: http://www.cs.wright.edu/~agoshtas/fig8.jpg

Twenty different skin cancer lesions

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How do you know if your sunscreen is a good UVA blocker?

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Know Your Sunscreen: Look at the Ingredients

Lotion has “inactive ingredients”

Don’t block UV light

UV blocking agents are “active ingredients”

Usually have more than one kind present

Source: Original Image

UV blocking agents suspended in a lotion

“Colloidal suspension”

Two kinds of active ingredients