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- Sun protection experts clarify the critical difference between SPF and UVA ratings—and why most people apply sunscreen wrong
- According to dermatologists and public health officials, nearly 90% of people misapply sunscreen by focusing only on SPF while ignoring UVA protection, leaving them vulnerable to long-term skin...
- The core distinction between SPF (Sun Protection Factor) and UVA protection lies in how each shields against different types of ultraviolet radiation, dermatologists say.
Sun protection experts clarify the critical difference between SPF and UVA ratings—and why most people apply sunscreen wrong
According to dermatologists and public health officials, nearly 90% of people misapply sunscreen by focusing only on SPF while ignoring UVA protection, leaving them vulnerable to long-term skin damage and premature aging. The Turkish Ministry of Health’s Public Health Directorate has warned that individuals in high-risk groups—including those with fair skin, a history of sunburn, or certain genetic conditions—should avoid outdoor exposure between 10:00 AM and 4:00 PM, when UV radiation peaks. Meanwhile, a recent analysis by CNN Türk identified five common sunscreen application mistakes that undermine protection, including skipping reapplication and using expired products.
The core distinction between SPF (Sun Protection Factor) and UVA protection lies in how each shields against different types of ultraviolet radiation, dermatologists say. SPF measures protection against UVB rays, which cause sunburn and contribute to skin cancer, while UVA rays penetrate deeper, accelerating aging and increasing cancer risk. A 2023 study published in Journal of the American Academy of Dermatology found that broad-spectrum sunscreens—those labeled with both SPF and UVA protection—reduce the risk of melanoma by 33% when used correctly. Yet the World Health Organization reports that fewer than 20% of global sunscreen users check for UVA labeling, a gap experts blame on marketing that prioritizes SPF numbers.
Why the SPF-UVA gap matters: The difference between a "broad-spectrum" sunscreen and one that only lists SPF
Broad-spectrum sunscreens are required by law in the U.S. and EU to include UVA protection, but labeling standards vary by country. In Turkey, where the Public Health Directorate’s advisory was issued, sunscreens must display a UVA circle logo (⭕) alongside SPF to indicate adequate UVA coverage. Dermatologist Dr. Ayşe Yılmaz of Istanbul University-Cerrahpaşa Medical Faculty told Sözcü Gazetesi that patients often assume an SPF 50 product blocks 98% of all UV rays—an incorrect interpretation. "SPF 50 blocks 98% of UVB rays, but UVA protection can vary widely even among high-SPF products," she said. The American Academy of Dermatology (AAD) confirms that UVA protection is often weaker in sunscreens marketed as "high SPF" but lacking the UVA label.
A 2024 consumer test by Demirören Haber Ajansı (DHA) found that 60% of popular Turkish sunscreen brands failed to meet EU minimum UVA standards when tested by independent labs. The discrepancy stems from how manufacturers measure UVA protection: some use the "star rating" system (⭐), where one star equals 1/3 of the SPF value, while others rely on the UVA Protection Factor (PA++++), a scale used in Asia. The Turkish Ministry of Health’s guidelines now recommend selecting products with at least three UVA stars or a PA+++ rating to complement SPF 30 or higher.
How to spot a truly protective sunscreen: The three labels to check
Public health officials emphasize that sunscreen efficacy depends on three key labels:
- Broad-spectrum (or the UVA circle logo ⭕): Indicates protection against both UVA and UVB rays.
- SPF 30 or higher: The AAD notes that SPF 30 blocks ~97% of UVB rays, while SPF 50 blocks ~98%—a marginal gain that doesn’t justify higher costs.
- Water-resistant (if swimming or sweating): Most sunscreens lose efficacy after 40–80 minutes in water, per FDA testing.
Dr. Yılmaz warned that even broad-spectrum sunscreens fail if not applied correctly. "Many people use a nickel-sized amount for their entire body, which is insufficient," she said. The AAD recommends using about one ounce (a shot-glass full) for full-body coverage. A study in JAMA Dermatology found that 73% of survey respondents underestimated how much sunscreen they needed, leading to uneven protection.
The public health crisis: Why misapplication leads to preventable skin damage
The Turkish Ministry of Health’s advisory follows a 2025 surge in skin cancer cases linked to improper sun protection, particularly among children. A report by Ihlas Haber Ajansı highlighted that pediatric dermatologists in Antalya and Izmir have seen a 40% increase in cases of actinic keratosis—a pre-cancerous skin condition—in patients under 18. "Ultraviolet rays can damage the cornea and retina in children as young as three," said Prof. Mehmet Öztürk of Hacettepe University, citing a 2023 DHA study that found UV exposure in early childhood raises the lifetime risk of cataracts by 25%.
Experts attribute the rise to cultural habits, such as seeking shade only under umbrellas (which block UVB but not UVA) and relying on clothing that doesn’t meet UV protection standards. The WHO’s Global UV Index ranks Turkey among the top 10 countries for high UV exposure, yet only 12% of Turks use sunscreen daily, according to a 2024 survey by the Turkish Statistical Institute. The ministry’s advisory targets this gap by advising high-risk groups to:
- Wear long-sleeved clothing and wide-brimmed hats.
- Apply sunscreen 15–30 minutes before sun exposure.
- Reapply every two hours, or immediately after swimming or sweating.
What’s next: New regulations and research on sunscreen effectiveness
The EU is set to tighten sunscreen regulations in 2026, requiring all broad-spectrum products to include a standardized UVA protection label (PA++++ or equivalent). In Turkey, the Public Health Directorate is collaborating with the Turkish Standards Institution (TSE) to mandate clearer UVA labeling on sunscreen packaging. Meanwhile, a clinical trial at Istanbul’s Marmara University is testing whether topical antioxidants (like vitamin C) can enhance UVA protection when used alongside sunscreen.
For now, dermatologists urge consumers to prioritize:
- Reapplication: Most sunscreens wear off in 2–3 hours, per FDA guidelines.
- Combination protection: Layering sunscreen with UV-blocking clothing and seeking shade during peak hours (10 AM–4 PM).
- Avoiding expired products: Sunscreen loses efficacy after 2–3 years, according to the AAD.
Key sources and further reading
- Turkish Ministry of Health Public Health Directorate advisory (June 2026)
- Journal of the American Academy of Dermatology (2023): Broad-spectrum sunscreen and melanoma risk
- Demirören Haber Ajansı (DHA) consumer test (2024): UVA protection in Turkish sunscreens
- American Academy of Dermatology (AAD) sunscreen guidelines
- World Health Organization (WHO) Global UV Index report (2025)