Sunscreen: Separating Fact from Fiction

Photoprotection remains the most effective preventive measure against skin aging and skin cancers. Yet, many misconceptions persist.

What SPF really means

SPF (Sun Protection Factor) only measures protection against UVB rays, which cause sunburn. SPF 30 filters 97% of UVB, SPF 50 filters 98%. The difference is minimal, but proper application is crucial.

Common myths

• "I never burn, I don't need sunscreen" — FALSE. UVA penetrate deeply and cause damage even without sunburn.
• "One application is enough for the day" — FALSE. Reapply every 2 hours and after each swim.
• "Dark skin does not need protection" — FALSE. The risk is lower but not zero.
• "Sunscreen prevents vitamin D synthesis" — In practice, no. Actual application still allows enough UV to pass through.

Practical recommendations

• Choose a broad-spectrum product (UVA + UVB), minimum SPF 30
• Apply a sufficient amount: approximately 2 mg/cm² (about 6 teaspoons for the entire body)
• Avoid exposure between 12 PM and 4 PM
• Combine with clothing, hats, and sunglasses