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Related Experiment Videos

How well are sunscreen users protected?

R Stokes1, B Diffey

  • 1Regional Medical Physics Department, Dryburn Hospital, Durham, UK.

Photodermatology, Photoimmunology & Photomedicine
|June 6, 1998
PubMed
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Most sunscreen users achieve only 20-50% of the labeled sun protection factor (SPF) due to insufficient application thickness. This underprotection may increase risks associated with sun exposure, potentially linking sunscreen use to melanoma.

Area of Science:

  • Dermatology
  • Photoprotection
  • Sunscreens

Background:

  • Sunscreen application thickness is crucial for achieving labeled sun protection factor (SPF).
  • Previous research indicates suboptimal sunscreen application by consumers.
  • Inadequate photoprotection may contribute to adverse skin health outcomes.

Purpose of the Study:

  • To objectively assess the relationship between sunscreen application thickness and the resulting photoprotection.
  • To quantify the reduction in SPF due to common underapplication of sunscreen.
  • To investigate the impact of varying titanium dioxide concentrations in sunscreen formulations.

Main Methods:

  • In vitro measurement of sunscreen protection using excised human epidermis.
  • Testing of sunscreens with different quantities of titanium dioxide.

Related Experiment Videos

  • Controlled variation of sunscreen application thickness.

    • Main Results:

    • Sunscreen application thickness significantly impacts the achieved SPF.
    • Actual user SPF is estimated to be 20-50% of the labeled SPF.
    • Formulation with titanium dioxide showed varying protection levels based on application.

    Conclusions:

    • Inadequate sunscreen application is a significant factor in reduced photoprotection.
    • Underprotection, combined with sun overexposure, could be a risk factor for melanoma.
    • Objective measurement of SPF is critical for understanding real-world effectiveness.