Sunscreen Ranker journal
The sunscreen
journal.
Daily, evidence-led notes on SPF, UV filters, and sun protection — every claim sourced, no cap.
- Seasonal Snow Blindness Is Real: What Winter Photokeratitis Does and How to Prevent It Reflected UV off snow can give your eyes a painful sunburn, and it's the best argument there is for goggles on the slopes. Read it →
- Application What 'Broad Spectrum' Really Means, and Why SPF Alone Won't Save You From UVA There's one word on the label that decides whether you're protected from the UVA rays that age skin and drive cancer. Read it →
- Formulation Does Sunscreen Cause Vitamin D Deficiency? A 2025 Trial Adds Nuance to the Myth The 'sunscreen blocks vitamin D' claim is half-wrong and half-right, and a 2025 randomized trial shows exactly where the truth sits. Read it →
- Skin cancer The Sun-D Trial: Does Daily SPF 50+ Really Raise Your Vitamin D Risk? The first large randomized trial to test the sunscreen-vitamin D claim is in, and the real-world answer is more nuanced than the headlines. Read it →
- Formulation Mineral Sunscreens Recalled for 'Splitting': The 2025 Australian Separation Recalls Several zinc sunscreens were pulled in Australia in late 2025 for physically separating in the bottle, here's why that compromises protection. Read it →
- UV science 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 it →
- Skin cancer AI in the Exam Room: 2025 Studies Show DermaSensor Helps Doctors Catch More Melanomas New 2025 data shows an FDA-cleared AI device helps primary-care doctors miss fewer melanomas, but it doesn't replace your dermatologist. Read it →
- Filter chemistry The SAFE Sunscreen Act Just Became Law: Here's the Real Timeline for Better US Sunscreen A quiet November 2025 law could reshape the US sunscreen aisle, but the better filters won't appear overnight. Read it →
- Filter chemistry The 2025 SAFE Sunscreen Act Targets the Korean and Japanese Filters You Can't Buy in the US A law signed in November 2025 finally pushes the FDA to look at the advanced UV filters that Korea and Japan have used safely for years. Read it →
- UV science 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 it →
- Seasonal UV and Your Eyes: Photokeratitis, Cataracts and Why Sunglasses Aren't Optional Sun protection isn't just skin-deep; your eyes are vulnerable to UV too, and the long-term toll can include cataracts. Read it →
- Application Snow Days Are Sun Days: 80% UV Reflection and the Altitude Effect Cold weather doesn't switch off the sun; snow doubles the UV hitting your skin and altitude turns it up further. Read it →
- UV science 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 it →
- Seasonal Can You Get Sunburned Through a Window? The UVA Glass Lets In Glass blocks UVB, so you won't burn at your desk, but the UVA streaming through still ages skin and raises cancer risk. Read it →
- Trends How to Read the UV Index Like a Pro (And Why Tanfluencers Misuse It) The UV Index is a free, location-specific warning system, not a tanning leaderboard, and reading it right keeps you off the burn line. Read it →
- Application Sunscreen for Babies Under 6 Months: Why Shade Comes First For the youngest infants, the safest sun protection isn't sunscreen at all, and pediatric authorities are clear about why. Read it →
- UV science '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 it →
- Seasonal UPF vs. SPF: Decoding the Number on Your Sun Shirt SPF rates your lotion; UPF rates your shirt, and understanding the difference tells you why a good garment can outwork sunscreen all day. Read it →
- Trends Does UPF Clothing Beat Sunscreen? The Data Behind the Viral Trend Sun-protective apparel is everywhere on your feed, and for once the hype holds up: the lab numbers favor fabric. Read it →
- Application 'Sunscreen Absorbs Into Your Blood': What That Headline Really Means Yes, some chemical filters enter the bloodstream, but absorption is not the same as harm, and quitting sunscreen carries its own real risk. Read it →
- UV science 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 it →
- Seasonal Your Beach Umbrella Is Only SPF 3-7: The Truth About Shade That umbrella feels protective, but scattered and reflected UV sneaks in from the sides, giving you far less defense than you think. Read it →
- Skin cancer Lancet Countdown 2025: Heat Deaths Up 23%, Now 546,000 a Year A landmark health-and-climate report reframes sun and heat as a public-health emergency, not a summer inconvenience. Read it →
- Trends Spray Sunscreen Done Right: Why the FDA Says Never Aim It at Your Face Spray sunscreen is convenient, but the way most people use it leaves skin badly under-protected, and the FDA has safety concerns worth knowing. Read it →