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Debunking Common Sunscreen Misconceptions and Tips for Effective Sun Protection : Chemical vs Physical Sunscreen

  • UVPro
  • May 12, 2024
  • 3 min read
Explore the truths behind common sunscreen myths, discover key ingredients for effective sun protection, and learn additional ways to shield your skin from harmful UV rays. Read more...
 

Topics

  • Common Misconceptions About Sunscreen

  • How Sunscreens Work

  • SPF Efficacy

  • Tips for Shopping for Sunscreen

  • Most Effective Ingredients in Sunscreen

  • Alternative Sun Protection Methods

 
physical chemical sunscreen

Photo: Techei

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Common Misconceptions About Sunscreen


Although it is commonly accepted that sunscreen plays a crucial role in protecting our skin from harmful UV, there are still many misconceptions exist about how it works and what makes for effective sun protection. This post is focused on these misunderstandings and goal is to provide you with expert tips for choosing the best sunscreen and additional protective measures.


physical chemical sunscreens


How Sunscreens Work


A widespread misconception about sunscreen is how they actually work. Chemical sunscreens work by absorbing UV radiation. They do not physically block it. Because they absorb light over time the product can become saturated or overwhelmed allowing excess UV rays to "overflow" onto the skin, similar to a cup overflowing with water. Have you ever had an experience where you "literally wore tons of sunscreen and reapplied and still burned"? This phenomenon might be explained by the way these products have a limit to how much they can work. It is another reason that frequent re-applications are necessary based on circumstances. In contrast, physical sunblocks, like those containing zinc oxide or titanium dioxide, act as a shield, blocking UV rays from reaching the skin.



SPF Efficacy


Another point of confusion about sunscreens is understanding the SPF (Sun Protection Factor) listed on sunscreen bottles. The SPF value only provides information on how effective the product is to prevent a sunburn. It informs us about the amount of UVB blocked by the product. That's it. It does not provide is with information on UVA blockage, blue light blockage, or other wavelengths of light. This is vital to understand as this is often misunderstood. From a skin cancer perspective, this means that sunscreen is blocking the rays that place us at highest risk for Basal Cell Carcinoma and Squamous Cell Carcinoma, but not entirely for melanoma as this cancer is linked more closely to UVA exposure. Although it is recommended to seek the words "broad spectrum" on sunscreens as an indication of UVA coverage, the reality is that this term does not tell us the amount of UVA blockage present in the product. It only indicates that there are some ingredients present known to provide some UVA protection but not necessarily how much.


The SPF number also assumes that the sunscreen is applied generously. If applied too sparingly, the effective SPF can be significantly lower than what's advertised, which diminishes its protective capabilities. The SPF value does not necessarily tell us how long this coverage is effective for simply because it will vary from person to person based on their inherent protection based on their skin type.



Tips for Shopping for Sunscreen


When shopping for sunscreen, focus on the ingredients rather than brand names or prices. Look for products with zinc oxide or titanium dioxide listed as active ingredients. These provide more reliable UV protection. Avoid being misled by attractive packaging and always read the ingredient list on the back of the bottle. Just because you spend more on a product does not mean it is better.



Most Effective Ingredients in Sunscreen


Zinc oxide and titanium dioxide are among the most effective ingredients for blocking UV rays. For extensive body coverage, consider sun-protective clothing, which can cover over 80% of the body's surface area and provide substantial protection against UV exposure.



physical chemical sunscreens


Alternative Sun Protection Methods


Besides sunscreen, sun protective clothing and accessories like hats and sunglasses play a vital role in sun safety. However, just because you are wearing clothing or hats does not mean that you are gaining adequate UV protection. A common white T-shirt, for example, may offer as little SPF as 3, and its protection level can decrease with washing and wear. Look specifically for tags and claims that offer an indication of testing performed that demonstrates the amount of UV blocked by these products. The testing will indicate the UPF or ultraviolet protection factor.


Understanding how sunscreen works and selecting the right products are key to effective sun protection. Along with sunscreen, incorporating sun-protective clothing and accessories into your daily routine can significantly reduce your risk of skin damage. Stay informed and protect your skin wisely.

 

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