Topic
UV Science Basics
articles.
Every UV Science Basics article in the journal — sourced, science-led, zero hype.
- 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 →
- 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 →
- 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 →
- 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 →
- UV science How Long Does It Take to Burn? MED and UV Index by Skin Type Your personal 'burn window' isn't a guess, it's set by your skin's minimal erythema dose and how high the UV Index climbs. Read it →
- UV science What Actually Happens Inside Your Skin During a Sunburn A sunburn isn't just surface redness; it's your skin detecting damaged DNA and ordering ruined cells to self-destruct before they turn cancerous. Read it →
- UV science The 'Base Tan' Myth: Why Pre-Tanning Equals Only About SPF 3 That pre-vacation 'base tan' you build to avoid burning is worth about SPF 3 - and it's already DNA damage you can't undo. Read it →
- UV science Endocrine Disruptors in Sunscreen: What the EU's 2025 Opinions Actually Said "Endocrine disruptor" is the scariest phrase in sunscreen marketing — the EU's 2025 case-by-case rulings show how scientists weigh hormone activity against real exposure. Read it →
- UV science A Tan Is Damage, Not a Glow: The Real Biology of Sun-Kissed Skin That 'healthy color' is actually your skin's emergency response to DNA injury that has already occurred. Read it →
- UV science EWG 2025: The Real Story Behind 'Fewer Than 1 in 4 Sunscreens Pass' Is the UVA Gap A high SPF number tells you almost nothing about UVA protection - the rays that drive aging and skin cancer - and EWG's 2025 data shows why broad-spectrum performance matters more. Read it →
- UV science The UVA Gap: Why 2025's New Filter Is About Aging, Not Just Burns SPF only measures sunburn protection — the real story behind 2025's filter news is UVA, the rays that age your skin and slip through many U.S. sunscreens. Read it →
- UV science Mineral vs. Chemical Sunscreen: Both Mostly Absorb UV The 'physical reflects, chemical absorbs' line you've heard a hundred times is mostly wrong — and the data on so-called mineral products is even messier. Read it →
- UV science 95% of the UV Hitting You Is UVA — The Aging Ray You Forget UVB gets the sunburn headlines, but the UV that reaches you all day is overwhelmingly UVA — the wavelength that quietly drives photoaging. Read it →
- UV science 2025 Trial: Polypodium + Red Orange Cut UVB Redness 46% A 2025 clinical trial gives the 'sunscreen pill' real numbers — but dermatologists are clear it supplements, never replaces, topical SPF. Read it →
- UV science How to Check the UV Index Where You Live (Free EPA Tools) The EPA's free SunWise app gives location-based daily and hourly UV forecasts — plus ZIP-code lookups, a 4-day map, and email UV Alerts to plan your day. Read it →
- UV science How to Read the UV Index: What Each Number Means and When to Cover Up Turn that abstract weather-app number into a daily decision: at a UV Index of 3 you need protection, and at 11+ skin can burn in minutes. Read it →
- UV science What 'Broad Spectrum' Really Means (the 370 nm Test) 'Broad spectrum' isn't a marketing word — in the US it's a measurable FDA pass/fail line at 370 nanometers. Read it →
- UV science Is Higher SPF Always Better? SPF 30 vs 50 vs 100 Reaching for the SPF 100 bottle feels safest, but dermatologists explain why the number alone can mislead you. Read it →
- UV science What SPF Actually Measures — and the Math Behind 15 vs 30 vs 50 SPF 100 isn't twice as protective as SPF 50 — here's the real math behind the number on the bottle. Read it →
- UV science UVA vs. UVB: What Each Ray Does to Your Skin and Why It Matters Once you know what UVA and UVB each do, you will understand why broad spectrum is the one word that actually matters in the sunscreen aisle. Read it →
- UV science Photoprotection for Eczema-Prone Skin: A 2025 Practical Guide If you have atopic dermatitis, "just wear sunscreen" isn't enough — here's the layered, UV-index-driven routine clinicians now recommend. Read it →