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Related Concept Videos

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The urethra is a hollowed tubular organ through which urine is expelled from the body. This structure extends from the bladder to the external opening, allowing urine to be released.
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The silent UVA.

Sérgio Schalka1, Marcelo de Paula Correa2

  • 1Medcin Skin Research Center, São Paulo, Brazil.

Journal of Photochemistry and Photobiology. B, Biology
|June 1, 2024
PubMed
Summary

Most sunscreens offer weak protection against ultraviolet A (UVA) radiation, leading to significant "silent UVA" exposure. Developing sunscreens with enhanced UVA protection is crucial for better skin health.

Keywords:
Skin agingSkin cancerSunscreening agentsUltraviolet rays

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Area of Science:

  • Dermatology
  • Photobiology
  • Cosmetic Science

Background:

  • Ultraviolet A (UVA) radiation's detrimental effects on skin are extensively documented.
  • Traditional sunscreens primarily target UVB protection, with less emphasis on UVA.
  • Current market sunscreens often exhibit a significant disparity in UVB versus UVA protection levels.

Purpose of the Study:

  • To analyze the transmission profiles of commercially available sunscreens.
  • To theoretically calculate and quantify user exposure to UVA radiation.
  • To introduce and define the concept of 'silent UVA' exposure.

Main Methods:

  • Analysis of transmission spectra for three distinct sunscreen products.
  • Theoretical calculations to estimate UVA exposure based on transmission data.
  • Literature review on UVA effects and sunscreen efficacy.

Main Results:

  • Commercial sunscreens demonstrate inadequate UVA light blocking capabilities.
  • Users are exposed to substantial amounts of UVA radiation, termed 'silent UVA'.
  • A significant gap exists between UVB and UVA protection in current sunscreen formulations.

Conclusions:

  • There is an urgent need for sunscreens with improved UVA protection.
  • Reducing 'silent UVA' exposure is essential for preventing long-term skin damage.
  • A new generation of sunscreens with higher UVA efficacy should be developed.