Sunscreen Ranker journal
The sunscreen
journal.
Daily, evidence-led notes on SPF, UV filters, and sun protection — every claim sourced, no cap.
- UV science 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 it →
- Skin cancer The Shot-Glass Rule: How Much Sunscreen You Really Need The most common reason sunscreen fails isn't the formula — it's that most people use a quarter of what they should. Here's the fix. Read it →
- UV science 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 it →
- Sensitive skin Tinted Sunscreen and Iron Oxides: The Visible-Light Defense for Melasma If you have melasma or stubborn dark spots, your untinted SPF may be leaving a gap — and iron oxides are the ingredient that closes it. Read it →
- Seasonal Does the Sun Burn the Same Year-Round? A Season-by-Season UV Guide Sun protection isn't a summer-only chore — here's how UVA and UVB behave across the calendar and why winter skin still needs SPF. Read it →
- Trends Sunscreen Pills Promised to Replace SPF. The FDA Says They Can't. A pill that protects you from the sun sounds great — but the FDA warned the companies selling it, and the science is firmly on topical SPF's side. Read it →
- Application 'Water Resistant' Isn't 'Waterproof': What the 40 and 80 Minute Labels Mean Beachgoers and athletes read 'water resistant' as 'reapply-free all day' — here's what the 40- and 80-minute labels actually promise. Read it →
- Global Japan's Hottest Summer Ever in 2025 — and a New 41.8°C National Record Japan just shattered its heat records, and more days of extreme UV is exactly why high-PA+++ Japanese sunscreens and diligent reapplication matter. Read it →
- Filter chemistry TPO Banned From September 2025: The UV Gel-Nail Chemical the EU Swept Out Not every 'UV' product is sunscreen — the EU's September 2025 TPO ban targeted the UV-cured gel manicures sitting right next to your SPF. Read it →
- Seasonal Why Korea's Record 2025 Summer Explains K-Beauty's SPF Obsession Korea's summers keep getting hotter and longer — and that's the backstory to why Korean sunscreen culture is built around easy, all-day reapplication. Read it →
- Global South Korea's Hottest Summer Since 1973: 28 Heatwave Days in 2025 A record-breaking Korean summer means more high-UV days — and a stronger case for the lightweight, reapply-friendly SPF that K-beauty built its reputation on. Read it →
- Skin cancer Why Men Die From Melanoma More Often — and How to Flip the Odds Melanoma is one of the few cancers that kills men more often than women — here's why, and the simple habits that change that. Read it →
- UV science 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 it →
- Sensitive skin Sunscreen With Eczema: Why Fragrance-Free Mineral Formulas Reduce Flares Eczema-prone skin needs sun protection too; here is how to choose an SPF that shields you from UV without triggering a flare. Read it →
- Formulation A 2025 Study Scores White Cast: How Much Zinc Before Mineral SPF Looks Ashy A 2025 PLoS One study built the first standardized white-cast scale, giving you a concrete zinc-oxide percentage rule for picking a mineral SPF that won't leave you ashy. Read it →
- Seasonal UVA vs. UVB: The Two Rays That Behave Completely Differently Understand the two main types of UV and every sunscreen label and UV-index forecast suddenly makes sense. Read it →
- Makeup + SPF The Tinted-Sunscreen Boom Is Real, But Brands Won't Tell You the Iron-Oxide Dose Tinted SPF is having a moment, but NPR flags a transparency gap: you often can't find out how much protective pigment is in the bottle. Read it →
- Formulation Why Tinted Sunscreen Is the Hidden Upgrade for Hyperpigmentation Tinted sunscreens do something clear formulas can't, and an NPR report explains why that matters most for melasma and hyperpigmentation-prone skin. Read it →
- Global TGA Recalls Ultra Violette Lean Screen: SPF 50+ That Tested as Low as 4 A cult-favourite 'invisible' zinc sunscreen got pulled in Australia in 2025, proof that an elegant, viral formula is worthless if the SPF doesn't hold up in the lab. Read it →
- Trends 'Tanmaxxing' and the Gen Z Tanning Bed Comeback Dermatologists Fear Romanticized tanning content is surging again on TikTok; here are the hard melanoma numbers behind why dermatologists are alarmed. Read it →
- Application SPF Doesn't Stack: Why 30 + 30 Isn't 60 Layering an SPF 30 moisturizer under SPF 30 makeup doesn't get you to SPF 60, and assuming it does can leave you under-protected. Read it →
- Kids & family SUNucate Expands: Tax-Free Sunscreen and Sunglasses at School The bill that lets kids use sunscreen at school just got an upgrade; if it reaches your state, SPF could get cheaper and sunglasses could count as official sun protection. Read it →
- Trends Influencers Aren't Dermatologists: Spotting Skin-Health Misinformation Social influencers aren't dermatologists; here is how to spot skin-health misinformation and what the actual evidence says about UV and skin cancer. Read it →
- Makeup + SPF The Ultra Violette Lean Screen Recall: SPF 50+ That Tested as Low as 4 A buzzy makeup-grade 'skinscreen' tested as low as SPF 4 in some labs, a cautionary tale for anyone treating hybrid SPF-makeup as their only sun protection. Read it →