The TRUTH Behind High SPF Sunscreens

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The TRUTH Behind High SPF Sunscreen...Do you really need them? How high should you go?

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If you have had skin cancer or a family history of skin cancer, then it is likely you are wearing sunscreen...and more likely it is a HIGH SPF sunscreen.

When we refer to a high spf sunscreen, in this video, we are referring to a sunscreen that is higher than SPF of 50.


A High SPF sunscreen may not really be high in the Sun Protection Factor. Proctor and Gamble tested a competitors SPF 100 sunscreen in 3 different labs.
The results varied between spf 37 - spf 75.
The small differences in application and light transmissions yielded such dramatic differences in results, they concluded that in the "real world" the differences would also be the most dramatic in differences in SPF protection.

High SPF provides just a tad bit better sun protection when properly applied:
For example, SPF 50 blocks 98 % of UVB rays and whereas SPF 100 blocks out 99% of UVB rays.

The higher the SPF, the more sunscreen chemicals it can contain.

High SPF sunscreens are not completely protecting you.
Most of the high SPF sunscreen are designed to block out UVB (burning rays) which is the main cause of sunburn and non-melanoma skin cancers.

UV A rays (aging rays) are related to higher risk of developing melanoma . These rays penetrate deeper into the skin and more difficult to block with sunscreen ingredients approved by the FDA.

High SPF sunscreen fare worse in balancing out UV A and UV B protection. High SPF sunscreens are better at protecting from sunburn which is the UV B protection NOT the UV A rays.
The ideal sunscreen would be an equal balance of protection from BOTH types of UV rays.

In the U.S., the FDA is still testing out ingredients for UV A protection.

For more information in regards to the FDA guidelines and testing on sunscreens, please watch:
   • Sunscreens What the Beauty Industry Doesn'...  

Sources:

Margaret L. Kripke. The ABCs of Sunscreen Protection Factors. Journal of Investigative Dermatology, 2003, 121(1), VII–VIII

Rachel Haywood et al., Measuring Sunscreen Protection Against Solar-Simulated Radiation-Induced Structural Radical Damage to Skin Using ESR/Spin Trapping: Development of an Ex Vivo Test Method. Free Radical Research, 2012, 46(3), 265–275.

Uli Osterwalder et al., The Long Way Towards The Ideal Sunscreen – Where We Stand and What Still Needs to be Done. Photochemical & Photobiological Sciences, 2010, 9(4), 470–481.

Hao Ou-Yang et al. High-SPF sunscreens (SPF ≥ 70) May Provide Ultraviolet Protection Above Minimal Recommended Levels by Adequately Compensating for Lower Sunscreen User Application Amounts. Journal of the American Academy of Dermatology, 2012, 67(6), 1220–1227.

Wei Liu et al. Sunburn Protection as a Function of Sunscreen Application Thickness Differs Between High and Low SPFs. Photodermatology, Photoimmunology & Photomedicine, 2012, 28(3), 120–126.

Procter & Gamble Company, Comments on the Revised Effectiveness Determination; Sunscreen Drug Prodcts for Over-the-Counter Human Use (Docket No. FDA-1978-N-0018, RIN 0910-AF43).

Joseph W Stanfield et al., Multi-laboratory validation of Very High Sun Protection Factor Values. Photodermatology, Photoimmunology & Photomedicine, 2011, 27(1), 30–34.

Celine Couteau et al., Effect of the Product Type, of the Amount of Applied Sunscreen Product and the Level of Protection in the UVB Range on the Level of Protection Achieved in the UVA Range. International Journal of Pharmaceutics, 2016, 500(1-2), 210–216.

Rachel Novick et al., Factors that Influence Sunscreen Application Thickness and Potential Preservative Exposure. Photodermatology, Photoimmunology & Photomedicine, 2015, 31(4), 212–223.

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