The Learning Lab
What Is Bemotrizinol? Tinosorb?
Short Answer Summary Bemotrizinol, often marketed under the name Tinosorb, is a modern chemical sunscreen ingredient used widely in Europe and Asia. It absorbs UV radiation and converts it to heat. It is more photostable than older chemical filters, but it is still petroleum-derived, still chemically active on skin,...
7 Reasons Sunscreen Stings Eyes. And How to Avoid It.
Picture this: you're getting ready for a beautiful day at the park with your family. You dutifully apply sunscreen to everyone's faces, and within minutes, your toddler is rubbing their eyes and crying. Sound familiar? You're not alone if you've ever dealt with sunscreen eye irritation during family outdoor adventures....
How to Apply Sunscreen Correctly
"Do I really need to reapply every two hours? Should I put it on under makeup? Is a little bit enough if I'm just running errands?" Sound familiar? You're not alone. Most people aren't applying sunscreen correctly, leaving their skin exposed to UVA and UVB damage. Here's how to get...
How to Train for a 5K Without Wrecking Your Skin
(A Guide for Runners Who Care About Health From Head to Toe) Training for your first 5K is a big step—congrats! Whether aiming for a fun run, a fundraising race, or a personal milestone, starting a running habit is a great way to build endurance, boost mood, and get outside...
The Outdoor Family's Guide to Zinc Oxide Sunscreen
Spending time outdoors as a family is one of life's great joys—from beach trips to mountain hikes to backyard play. But with more time under the sun comes greater responsibility to protect your family's skin safely and effectively. That's where zinc oxide sunscreen comes in. This guide explains why zinc...
Ancient Sunscreen is Similar to Today's Zinc Oxide Sunscreen
What if your sun defense routine isn't a modern invention but a return to a tradition that helped our ancestors outlive other human species? That's precisely what emerging archaeological and geophysical science suggests. Long before SPF ratings, chemical sunscreens, or dermatology, Homo sapiens were already solving the sun problem. They...
