Choosing the Best SPF in Sunscreen

SPF stands for Sun Protection Factor. The higher the SPF number, the better protection against the sun's harmful UVB rays. The SPF number lets you know how much longer you can stay out of the sun without burning. For example, if it takes 15 minutes for a person to burn, an SPF 15 will allow them to stay out in the sun 15 times longer without burning.

How High Should SPF Be?

Experts recommend an SPF 15-30 with UVA and UVB ray protection. Higher SPFs provide only a smaller amount of protection (about 1-2%).

Fair skinned people who are sensitive to the sun may want to choose an SPF of 25-30. People with darker or olive toned skin should buy an SPF15 or higher to protect from burning. Keep in mind that darker skin is not immune to the damaging effects of the sun. It may not burn as easily, but is still affected by the sun's rays.

Experts recommend an SPF 15 with "broad spectrum" protection for daily sunscreen use.

It is important to follow manufacturer's instruction for application.



Source
Memorial Healthcare System. Shedding the Light on Sunscreen: What SPF Is Right for You?

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5 Common Sunscreen Mistakes: Applying Sunscreen Correctly Maximizes Skin Cancer Prevention

We all know that regularly using sunscreen is one of the best ways to prevent skin cancer. Unfortunately, many people make mistakes when it comes to wearing sunscreen. Properly applying sunscreen and following manufacturer instructions are key to maximum protection.
Common Sunscreen Mistakes

1. Applying sunscreen after going outdoors.

Sunscreen needs to be applied 15 to 30 minutes before going outside to allow it to be absorbed into the skin. Follow manufacturer's instructions for absorption time.

2. Not applying enough sunscreen.

The application estimate is about 1 oz. for an adult. Keep in mind that all body parts that will be exposed to the sun need to be protected. Neglected areas include the face, ears, neck and feet.

3. Not reapplying after swimming.

Sunscreen not labeled "waterproof" or "water resistant" does come off while in the water. Even waterproof and water resistant sunscreen provide a limited time amount of protection. Check the sunscreen label for how often to reapply waterproof and water resistant sunscreens.

4. Not reapplying sunscreen at all.

Many people have the misconception that one application of sunscreen will provide all-day protection. Not true. Sunscreen needs to be reapplied generally every two hours. Check the label for specific instructions.

5. Using sunscreen only when it is sunny.

Sunscreen needs to be used in the sun and in the shade. Harmful UV rays can still affect people when it's cloudy.


Source:

"Skin Cancer Prevention". What You Need to Know About Skin Cancer. National Cancer Institute. 01 Aug 2005. Accessed 25 June 2008.
http://cancer.about.com/gi/dynamic/offsite.htm?zi=1/XJ&sdn=cancer&cdn=health&tm=37&f=21&su=p284.9.336.ip_p736.8.336.ip_&tt=2&bt=0&bts=1&zu=http%3A//www.cancer.gov/cancertopics/wyntk/skin/page6

"Let's Prevent & Against Cancer"

How to Choose the Best Sunscreen

If you have ever been to the tanning/sunscreen aisle at your local drugstore, you know how overwhelming it can be. SPF this, UVA that, and then throw in UVBs in the mix and the confusion begins!

Choosing the Right SPF

SPF stands for Sun Protection Factor. The higher the SPF number, the better protection against the sun's harmful UVB rays. The SPF number lets you know how much longer you can stay out of the sun without burning. For example, if it takes 15 minutes for a person to burn, an SPF 15 will allow them to stay out in the sun 15 times longer without burning.

The American Academy of Dermatology recommends wearing an SPF of 15 or higher for maximum protection. SPF is available in factors from 2-60. Does highest mean the best protection? Not necessarily. An SPF of 50 only provides 1-2% more protection than an SPF30.

UVA and UVB Protection

The label of the sunscreen will indicate the UVA or UVB protection. UVA rays are responsible for the aging effect of the sun. However, overexposure to UVA rays can cause skin cancer.

UVB rays are responsible for sunburns and skin cancer. Choose a product that has states "UVA/UVB" protection or has "broad spectrum" protectant.

Waterproof vs Water Resistant

If you are looking for a sunscreen to use while in the water, choose a sunscreen that is "waterproof" or "water resistant"."Waterproof" sunscreen should provide protection in the water for 80 minutes, while "water resistant" provides only 40 minutes of protection.


Source
U. S. Food and Drug Administration. Center for Food Safety and Applied Nutrition Office of Cosmetics and Colors Fact Sheet June 27, 2000; Sunscreens, Tanning Products, and Sun Safety
Memorial Healthcare System. Shedding the Light on Sunscreen: What SPF Is Right for You?

"Let's Prevent & Against Cancer!"