Sunscreen Ranker journal
The sunscreen
journal.
Daily, evidence-led notes on SPF, UV filters, and sun protection — every claim sourced, no cap.
- Application The Two-Finger Rule, Demonstrated Exactly how much sunscreen goes on your face, measured. Read it →
- Global The 34 vs 16 Problem: A Filter Map of the World Europe has 34 approved UV filters. The US has 16. Here's the gap. Read it →
- Formulation Why Some Sunscreens Pill and Others Glide The formulation science behind that annoying eraser-crumb effect. Read it →
- UV science Why Clouds Are Not Sunscreen Overcast doesn't mean off-duty for your skin. Read it →
- Skin cancer 1 in 5 Americans Will Get Skin Cancer — Start the Year Knowing the Odds The stat that should reframe how you think about a $15 bottle. Read it →
- Seasonal Do You Need Sunscreen Indoors in Winter? (The Window Answer) Your desk-by-the-window setup has a UVA problem. Read it →
- Filter chemistry Meet Tinosorb S, the Filter the Rest of the World Has Loved for 20 Years Broad-spectrum, photostable, and finally US-bound. Read it →
- Trends Sunscreen Myths That Went Viral — Fact-Checked Your FYP lied to you. Let's clean it up. Read it →
- UV science What the UV Index Actually Means (and When to Care) That little number in your weather app is more useful than you think. Read it →
- Application You're Probably Using a Quarter of the Sunscreen You Need The uncomfortable truth behind why your SPF "isn't working." Read it →
- Global Why Your Korean Sunscreen Feels Like Water and Your American One Feels Like Paste It's not the brands; it's the filters they're legally allowed to use. Read it →
- Seasonal Skiing This Winter? Snow Is a UV Mirror Why slope days fry your face even when it's freezing. Read it →
- UV science UVA vs UVB, Explained Like You're Scrolling at 2AM The single most useful thing to understand about sun damage, in 60 seconds. Read it →
- Seasonal No, You Don't Get a Sunscreen Break Just Because It's January Winter sun is sneakier than summer sun, and here's the receipts. Read it →
- Filter chemistry 2026 Is the Year the US Finally Gets a New Sunscreen Filter Bemotrizinol is coming, and here's why skincare nerds are losing it. Read it →
- Trends Your 2026 Skin Resolution: The One Habit Dermatologists Beg You to Keep New year, same sun: daily SPF is the highest-ROI resolution you'll make. Read it →
- UV science The Spots Everyone Misses: Ears, Scalp, Lips, and Tops of the Feet The places you forget to cover — ear tops, the part in your hair, your lips, the backs of your hands — are exactly where skin cancers like to start. Read it →
- UV science Sun Damage Adds Up: How a Lifetime of UV Becomes Spots and Precancers The five-minute walks and sunny commutes you forgot about are quietly compounding into the spots and precancers that show up after 40. Read it →
- UV science Does Sunscreen Expire? When to Toss Last Summer's Bottle FDA rules mean your bottle should hold its SPF for three years — but a summer in a hot car can quietly cut that short. Read it →
- Seasonal Winter Sun Protection: Your Skin Is Still Aging Under the Clouds The burning rays back off in winter, but the aging-and-cancer rays barely budge — here's why you keep wearing sunscreen. Read it →
- UV science What UPF Really Means on Clothing (and When Fabric Beats SPF) A UPF 50 shirt blocks 98% of UV all day without a single reapplication — here's how that label actually works. Read it →
- Seasonal When the UV Index Is High, Reapply: Why SPF Wears Off Every Two Hours The UV index tells you how strong the sun is - but reapplication is the step most people get wrong, and it's why your SPF fades by midday. Read it →
- UV science Does Sunscreen Block Vitamin D? Balancing Sun Safety and Vitamin D The 'but I need sun for vitamin D' objection to daily sunscreen, settled with the AAD's actual position. Read it →
- Kids & family Cancer Council Kids Sunscreen Recalled: When 'Separation' Means Lost SPF Even a sunscreen from a cancer charity got recalled in 2025 - and the reason is a defect any parent can spot before slathering it on a kid. Read it →