If you take only one thing from this article: Always choose a broad-spectrum sunscreen. A product that only protects against UVB offers insufficient protection. The real danger lies in the combination of UVA and UVB — and only a broad-spectrum sunscreen covers the entire UV spectrum.
A sunscreen that only blocks UVB prevents sunburn — but leaves you defenceless against UVA radiation. This is particularly deceptive:
| Filter | INCI | Protection Range | Features | |--------|------|-----------------|----------| | Tinosorb S | Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine | 280–400 nm | Photostable, lipophilic, synergistic | | Tinosorb M | Methylene Bis-Benzotriazolyl Tetramethylbutylphenol | 280–400 nm | Particle filter, triple action | | Mexoryl XL | Drometrizole Trisiloxane | 280–400 nm | Photostable, lipophilic | | Uvinul A Plus | Diethylamino Hydroxybenzoyl Hexyl Benzoate | 310–400 nm | Strong in UVA-I range | | Zinc Oxide | Zinc Oxide | 280–400 nm | Mineral, complete broad-spectrum |
| System | Region | Criterion | |--------|--------|-----------| | UVA in circle | EU | UVA-PF ≥ 1/3 of SPF | | PA++++ | Japan | PPD > 16 | | Broad Spectrum | USA | Critical wavelength ≥ 370 nm | | BOOTS Star Rating | UK | 5-star scale for UVA/UVB ratio |
A broad-spectrum sunscreen protects against UVA and UVB (280–400 nm), unlike products that only block UVB.
Look for: UVA in circle (EU), PA++++ (Japan), or "Broad Spectrum" (USA). Alternatively, check the filter list for Tinosorb S/M, Mexoryl XL, or Zinc Oxide.
No. SPF 50 only guarantees UVB protection. Always check the UVA labelling.
Yes. UVA is relevant year-round, even in winter. A broad-spectrum SPF 30+ on the face is recommended year-round.
Sources: European Commission Cosmetics Regulation, FDA Sunscreen Monograph, JCIA, Photochemical & Photobiological Sciences, JAAD.
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