With all of this possible damage, it pays to wear sunscreen, but which one should you use?
Which Sunscreen Should You Use???
New and Improved
Now with Nano-Z
Goes on Clear
Safe for Children
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?
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
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
A Brief History of Sunscreens: The UVA Problem
UVA rays have no immediate visible effects but cause serious long term damage
Sunscreen makers working to find UVA blockers
No official rating of UVA protection yet
Twenty different skin cancer lesions
How do you know if your sunscreen is a good UVA blocker?
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
Two kinds of active ingredients