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UV Science Basics articles.

Every UV Science Basics article on the blog — sourced, science-led, zero hype.

UV science 21 Nov 2025 Does Blue Light Damage Skin? What the HEV Research Actually Shows Cutting through the 'blue light skincare' hype: here's what's actually evidenced about visible light and skin, and for whom it matters most. Read article →
UV science 15 Nov 2025 30 Years of Data: Rising UV Is Driving Melanoma Most in Wealthy, Low-UV Countries A 2025 analysis of 176 countries reframes who is most at risk as surface UV climbs, and it isn't only the sunniest places. Read article →
UV science 11 Nov 2025 How the Ozone Layer Is Your First Line of UV Defense Before any sunscreen touches your skin, a thin band of atmospheric ozone is already filtering the sun's most dangerous rays. Read article →
UV science 08 Nov 2025 PA+ to PA++++ and PPD: How Asian Sunscreens Rate UVA Protection Those plus signs on your K-beauty and J-beauty sunscreen are a precise UVA grade, and here's exactly what they measure. Read article →
UV science 04 Nov 2025 'Water Resistant' Isn't 'Waterproof': Reading the 40- and 80-Minute Labels There's no such thing as waterproof sunscreen, and the number on the bottle tells you exactly when your protection runs out in the water. Read article →
UV science 31 Oct 2025 Why the Two-Hour Reapply Rule Is the Step You Keep Skipping Your morning application has an expiration time, and a higher SPF doesn't buy you a longer day in the sun. Read article →
UV science 26 Oct 2025 How Much Sunscreen Are You Actually Supposed to Use? The Teaspoon & Shot-Glass Rule Your 'SPF 50' may be performing like SPF 20-25 for one simple reason: most people apply only a fraction of the amount the label was tested with. Read article →
UV science 22 Oct 2025 When Is UV the Strongest? The 10 a.m.-4 p.m. Rule Explained There's a simple, memorable window for the most intense sun of the day—and understanding solar noon explains exactly why it exists. Read article →
UV science 17 Oct 2025 Why UV Is Stronger at the Beach, on Snow, and at Altitude Ski trips and beach days hit you with UV from below as well as above—here's the physics of reflection and thin air that makes them so deceptively intense. Read article →
UV science 13 Oct 2025 Climate Change Is Now a Skin Cancer Driver: Longer UV Seasons, Slow Ozone Recovery A 2025 review shows warming isn't just longer beach days—it lengthens UV seasons and pushes melanoma rates higher in places that were never sun-prepared. Read article →
UV science 09 Oct 2025 Can You Get Sun Damage Through Car and Office Windows? Your windshield blocks most UVA, but the side window barely tries — which is why drivers age unevenly and why glass isn't real sun protection. Read article →
UV science 03 Oct 2025 Up to 80% of UV Gets Through Clouds — Yes, You Still Burn Gray skies feel like a sunscreen day off, but up to 80% of UV slips through cloud cover — so the burn and the DNA damage still happen. Read article →
UV science 21 Sept 2025 UV Radiation Isn't Heat: Why You Can Burn on a Cold, Cloudy Day Your skin senses heat, not UV — which is exactly why a cold, overcast day can hand you a sunburn you never saw coming. Read article →
UV science 09 Sept 2025 Sun-D Trial 2025: Daily High-SPF Lowered Vitamin D — Supplement, Don't Skip A 2025 randomized trial found daily high-SPF sunscreen nudged vitamin D down — but the answer is a supplement, not skipping your sunscreen. Read article →
UV science 07 Sept 2025 Yes, Darker Skin Needs Sunscreen Too — Here's the Science Melanin helps, but it's not a force field — and the survival gap in skin cancer for people of color shows why everyone needs sun protection. Read article →
UV science 28 Aug 2025 The Fitzpatrick Skin Type Scale: Finding Your Type and Sun Sensitivity Find your Fitzpatrick skin type and you can calibrate sun-protection habits to how your skin actually responds to UV. Read article →
UV science 10 Aug 2025 How Long Does It Take to Burn? MED and UV Index by Skin Type Your personal 'burn window' isn't a guess, it's set by your skin's minimal erythema dose and how high the UV Index climbs. Read article →
UV science 31 Jul 2025 What Actually Happens Inside Your Skin During a Sunburn A sunburn isn't just surface redness; it's your skin detecting damaged DNA and ordering ruined cells to self-destruct before they turn cancerous. Read article →
UV science 23 Jul 2025 The 'Base Tan' Myth: Why Pre-Tanning Equals Only About SPF 3 That pre-vacation 'base tan' you build to avoid burning is worth about SPF 3 - and it's already DNA damage you can't undo. Read article →
UV science 01 Jul 2025 Endocrine Disruptors in Sunscreen: What the EU's 2025 Opinions Actually Said "Endocrine disruptor" is the scariest phrase in sunscreen marketing — the EU's 2025 case-by-case rulings show how scientists weigh hormone activity against real exposure. Read article →
UV science 01 Jun 2025 A Tan Is Damage, Not a Glow: The Real Biology of Sun-Kissed Skin That 'healthy color' is actually your skin's emergency response to DNA injury that has already occurred. Read article →
UV science 26 May 2025 EWG 2025: The Real Story Behind 'Fewer Than 1 in 4 Sunscreens Pass' Is the UVA Gap A high SPF number tells you almost nothing about UVA protection - the rays that drive aging and skin cancer - and EWG's 2025 data shows why broad-spectrum performance matters more. Read article →
UV science 14 May 2025 The UVA Gap: Why 2025's New Filter Is About Aging, Not Just Burns SPF only measures sunburn protection — the real story behind 2025's filter news is UVA, the rays that age your skin and slip through many U.S. sunscreens. Read article →
UV science 04 May 2025 Mineral vs. Chemical Sunscreen: Both Mostly Absorb UV The 'physical reflects, chemical absorbs' line you've heard a hundred times is mostly wrong — and the data on so-called mineral products is even messier. Read article →