The Learning Lab

How Much Sunscreen Should You Use?

By Kari Kenner March 30, 2026 |

Most people should use: Face and neck: 2 finger-lengths of sunscreen Full body: 1 ounce (a shot glass) Reapply: every 2 hours Most people apply only 25–50% of this amount, which significantly reduces protection. How Much Sunscreen Should You Use on Your Face? Use the two-finger rule: Squeeze sunscreen along...

Is Zinc Oxide Sunscreen Safer? The Truth About Mineral vs Chemical Sunscreen

By Kari Kenner March 21, 2026 |

Yes. Zinc oxide sunscreen is safer. Not slightly. Fundamentally. It protects your skin without being absorbed into your body. That is the key difference between mineral and chemical sunscreen. Zinc oxide sits on top of your skin and reflects UV rays. Chemical sunscreens absorb UV radiation and convert it into...

Waxhead Sunscreen vs. Chemical Sunscreen: What You Need to Know

By Kari Kenner February 25, 2026 |

Short Answer: Waxhead Sunscreen uses non-nano zinc oxide, a physical mineral that sits on top of your skin and blocks both UVA and UVB rays without absorbing into your bloodstream. Chemical sunscreens work differently. They absorb into your skin, convert UV radiation into heat, and several of their active ingredients...

Mineral vs Chemical Sunscreen Mega Guide

By Kari Kenner February 22, 2026 |

Quick answer: Mineral sunscreen uses zinc oxide or titanium dioxide to sit on the skin surface and block UV rays. Chemical sunscreens absorb UV radiation and convert it to heat. For sensitive skin, children, and reef-conscious travel, mineral sunscreen with non-nano zinc oxide is widely recommended. Table of Contents Mineral...

Mineral vs Chemical Sunscreen for Acne-Prone Skin

By Kari Kenner August 20, 2025 |

If you're the mom of a teenager dealing with acne, you know how challenging it can be to find skincare products that protect without making breakouts worse. The last thing you want is for your teen's sunscreen (something that should be protecting their skin) to trigger more pimples just when...

7 Reasons Sunscreen Stings Eyes. And How to Avoid It.

By Kari Kenner August 20, 2025 |

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....