Sun Protection Science

Beyond the Number: What the UV Index Doesn't Tell You About Your Real Sun Exposure

Millions of Americans glance at the UV index each morning and assume they understand their sun exposure risk for the day. But the standard scale omits critical variables — from altitude and reflective surfaces to individual skin type — that can dramatically alter how much ultraviolet radiation actually reaches your skin.

Jul 25, 2026

Decoding Your Sunscreen Label: The Truth Behind SPF Numbers and Broad-Spectrum Claims

Most Americans choose sunscreen based on SPF numbers alone, but that single figure tells only part of the story. Understanding the distinct roles of UVA and UVB radiation—and what your label actually measures—can mean the difference between genuine protection and a false sense of security. This guide cuts through the marketing noise to give you the science you need.

Jul 25, 2026