Sunscreen Ranker journal
The sunscreen
journal.
Daily, evidence-led notes on SPF, UV filters, and sun protection — every claim sourced, no cap.
- Filter chemistry Why Octinoxate Is Falling Out of Favor How octinoxate went from sunscreen staple to banned-in-Hawaii filter. Read it →
- Sensitive skin Eczema-Prone Skin and Sunscreen: A Gentle Approach How to protect compromised skin without triggering flare-ups. Read it →
- Application Reapplication Reality: A Realistic Beach Day Plan How to actually reapply for 8 hours in the sun. Read it →
- Global What 'Quasi-Drug' Means on a Japanese Sunscreen Decoding the regulatory label on your J-beauty favorite. Read it →
- UV science Why Your Phone's Weather App Knows the UV Index How UV forecasting actually works. Read it →
- Formulation How Tinted Sunscreens Protect Against Blue Light The iron-oxide science behind the color. Read it →
- Trends The 'SPF in Everything' Trend: Helpful or Hype? SPF moisturizers, primers, lip balms: do they actually count? Read it →
- Skin cancer Don't Wait for Summer: April Is When Damage Restarts Spring sun is already doing the work — protect now. Read it →
- Filter chemistry The Filters Behind Anthelios UVMune 400 Inside the formula that made ultra-long UVA protection mainstream. Read it →
- Sensitive skin Sunscreen for Melasma: Why UVA and Visible Light Protection Matter Most Pigmentation needs more than UVB defense. Read it →
- Application Can You 'Stack' SPF? (SPF 30 Moisturizer + SPF 30 Sunscreen) The math everyone gets wrong about layering SPF. Read it →
- Global Bioderma, La Roche-Posay, Beauty of Joseon: A Global Sunscreen Tour The international cult favorites, and what actually makes them special. Read it →
- UV science The Science of 'Persistent Pigment Darkening' (PPD) The UVA effect behind Asia's PA rating system. Read it →
- Formulation Why Reef-Friendly Formulas Are Getting Better Mineral innovation is closing the elegance gap. Read it →
- Trends April's Viral SPF: Worth the Hype or Hard Pass? TikTok's newest sunscreen obsession, reviewed honestly. Read it →
- Skin cancer Sunscreen and Skin Cancer Prevention: What 40 Years of Data Show The long-view evidence, beyond a single study. Read it →
- Filter chemistry Ecamsule (Mexoryl SX): L'Oréal's UVA Innovation The patented filter that gave the US a rare UVA upgrade. Read it →
- Sensitive skin The Best Sunscreen Ingredients for a Damaged Skin Barrier Repair and protect at the same time. Read it →
- Application Spray, Stick, Lotion, or Gel: Which Sunscreen Format Wins? Format affects how much protection you actually get. Read it →
- UV science Cumulative Sun Damage: Why It All Adds Up Every unprotected minute is a deposit in the damage bank. Read it →
- Global The Filter Gap, Visualized: A Side-by-Side World Map Which UV filters are legal where — at a glance. Read it →
- Formulation How Sunscreen Is Tested in a Lab (the SPF Number's Origin Story) Where that '50' on your bottle actually comes from. Read it →
- Application The Most Common Sunscreen Mistakes (and Easy Fixes) Seven everyday habits quietly undercutting your protection. Read it →
- UV science Why Latitude Changes How Much Sun Protection You Need Living closer to the equator changes the UV math. Read it →