Sunscreen Ranker journal
The sunscreen
journal.
Daily, evidence-led notes on SPF, UV filters, and sun protection — every claim sourced, no cap.
- Seasonal High-UV Destinations Where the Index Hits 11+ Year-Round Some destinations sit in the UV Index's 'Extreme' zone every single day — pack for them like you would for the surface of a much harsher sun. Read it →
- Trends What PA++++ and PPD Actually Mean on Asian Sunscreen Labels Those plus signs on your K-beauty sunscreen aren't marketing fluff — PA++++ is a real UVA rating, and here's the number behind it. Read it →
- Application Apply Sunscreen 15 Minutes Before You Go Out — Here's Why Slathering on sunscreen once you're already at the beach leaves a 15-minute window where you're basically unprotected — here's why timing matters. Read it →
- UV science 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 it →
- Sensitive skin Acne Actives and SPF: The Right Order for BP, Retinoids and Sunscreen Does sunscreen go before or after your benzoyl peroxide and retinoid? Here's the simple, dermatologist-backed sequence that ends the confusion. Read it →
- Seasonal Why the Sun Is Brutal at the Equator: Latitude, Ozone and UV The same midday sun that's mild at home can scorch you on a tropical trip — and the reason comes down to latitude, atmosphere and ozone. Read it →
- Trends Is the SPF in Your Makeup Enough? Why Foundation Falls Short Your SPF 30 foundation sounds like full coverage, but you'd need to trowel it on to hit that number — here's why a real sunscreen layer underneath is non-negotiable. Read it →
- Application Does Daily Sunscreen Cause Vitamin D Deficiency? The Evidence The fear that sunscreen will tank your vitamin D is one of the top reasons people skip it — here's what the clinical research actually shows. Read it →
- Skin cancer Actinic Keratosis: The Skin Precancer You Shouldn't Ignore That rough, scaly patch from years of sun isn't just dry skin — it's a fixable precancer, and treating it early can stop a squamous cell carcinoma before it starts. Read it →
- UV science 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 it →
- Sensitive skin Healing Acne Scars? Sun Protection Stops Them Darkening After scar treatment, sun can darken the very skin you're trying to heal — here's the dermatologist-backed protection plan for the weeks that matter most. Read it →
- Filter chemistry One Base, 21 Sunscreens: The Wild Child Formula That Failed SPF Dozens of 'different' sunscreen brands are built from the same wholesale base — and when Australia's TGA tested one shared formula, 21 products failed at once. Read it →
- Global Australia's TGA Flags 21 Sunscreens After CHOICE Test (2025) When a national regulator warns that 21 sunscreens may be far weaker than labeled, it's a lesson in why third-party SPF testing matters for the bottle in your bag. Read it →
- Sensitive skin Coppertone Recalls 5 Spray Sunscreens Over Benzene (2025) Coppertone pulled five aerosol sunscreens over benzene in September 2025 — here's how to check your lot numbers and why sensitive-skin users may want lotions instead. Read it →
- Makeup + SPF Tinted SPF Beat Clear Sunscreen for Melasma in a 2025 Trial A 2025 randomized trial shows the iron-oxide tint in your sunscreen isn't just coverage — it measurably kept melasma skin more even-toned through summer than a clear formula. Read it →
- Sensitive skin Tinted Sunscreen Beats Clear SPF for Melasma: A 2025 Randomized Summer Trial If clear SPF hasn't touched your stubborn dark patches, a 2025 trial explains why — and why iron-oxide-tinted sunscreen objectively outperformed it in real summer sun. Read it →
- Formulation 2025 Trial: Tinted Sunscreen Beat Untinted for Evening Out Melasma If you have melasma, the tint isn't just cosmetic — a 2025 trial shows iron-oxide color doing real work against the visible light that plain SPF lets through. Read it →
- Seasonal The Summer Solstice and Your Skin: Why Late June Brings the Year's Highest UV The longest day of the year is also the most intense — here's how the solstice translates to a concrete sun-protection takeaway. Read it →
- Trends Do People With Dark Skin Need Sunscreen? Debunking a Dangerous Melanin Myth Melanin helps — but nowhere near as much as the myth claims, and the consequences of believing it can be deadly. Read it →
- Application How to Actually Use Spray Sunscreen So It Works A quick spritz leaves you barely protected — here's how to use spray SPF so it actually does its job. Read it →
- Skin cancer Driver's-Side Skin Cancer: Why UVA Through Car Windows Hits Your Left Arm Your commute is sun exposure you've never accounted for — and the data shows it shows up on your left side. Read it →
- UV science 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 it →
- Sensitive skin Acne Dark Spots: Why Sunscreen Is the Most Proven Way to Stop PIH If you're chasing serums to fade acne marks, you're skipping the single highest-evidence step — daily SPF is what stops post-inflammatory hyperpigmentation from getting worse. Read it →
- Seasonal Spring Is the Sneakiest Sunburn Season: Why March–May Catches You Off Guard Cool air fools you into skipping SPF — but by late spring the sun is already as strong as late summer, on skin that hasn't seen the sun all winter. Read it →