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Which Sunblock SPF is Best?

Published in Sun Protection 2 mins read

The American Academy of Dermatology recommends choosing a sunscreen with an SPF of 30 or higher.

Understanding SPF and Sun Protection

SPF, or Sun Protection Factor, measures how well a sunscreen protects your skin from UVB rays, the kind of radiation that causes sunburn, skin damage, and can contribute to skin cancer. It's crucial to understand what SPF numbers actually mean in terms of protection:

  • SPF 30: Blocks about 97% of UVB rays.
  • SPF 50: Blocks about 98% of UVB rays.
  • SPF 100: Blocks about 99% of UVB rays.

While higher SPFs offer slightly more protection, the difference becomes marginal beyond SPF 30. More importantly, no sunscreen blocks 100% of UVB rays.

Why SPF 30 or Higher is Recommended

  • Sufficient Protection: SPF 30 provides excellent protection for most people in most situations.
  • Realistic Application: People often don't apply sunscreen as thickly or as frequently as they should. Using a higher SPF can compensate for inadequate application.
  • Broad Spectrum Protection: Ensure the sunscreen is "broad spectrum," meaning it protects against both UVA and UVB rays. UVA rays contribute to premature aging and skin cancer.

Additional Considerations for Sunscreen Selection

Beyond SPF, consider these factors:

  • Broad Spectrum: Essential for protection against both UVA and UVB rays.
  • Water Resistance: Choose a water-resistant sunscreen if you'll be swimming or sweating. Reapply every 40-80 minutes as indicated on the product.
  • Skin Type: Consider your skin type (e.g., sensitive, oily) when selecting a sunscreen formula. Options include lotions, creams, gels, and sticks.
  • Ingredients: Some ingredients, like oxybenzone and octinoxate, can harm coral reefs. Consider using mineral-based sunscreens (containing zinc oxide or titanium dioxide) if you'll be swimming in areas where these chemicals are a concern.

Conclusion

For optimal sun protection, select a broad-spectrum sunscreen with an SPF of 30 or higher, and apply it liberally and frequently. Reapplication is essential, especially after swimming or sweating.

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