---
title: "Broad Spectrum — Glossary | School of Dermatology"
url: https://schoolofdermatology.com/glossary/broad-spectrum
description: "Understand what broad spectrum means in sunscreen, why UVA and UVB protection both matter, and how to choose effective sun protection."
lang: en
---

Glossary

# Broad Spectrum

brawd SPEK-trum

## Definition

Broad spectrum is a sunscreen classification indicating that a product protects against both UVA and UVB rays. UVB rays cause sunburn and play a direct role in skin cancer development, while UVA rays penetrate deeper into the skin, contributing to premature aging, wrinkles, and also increasing cancer risk. A sunscreen labeled 'broad spectrum' has been tested and proven to provide proportional protection across the entire UV spectrum. SPF alone only measures UVB protection, so the broad-spectrum designation is critical for comprehensive sun protection. In many countries, sunscreen regulations require specific testing methods (like the critical wavelength test) to earn the broad-spectrum label. Dermatologists recommend using a broad-spectrum SPF 30 or higher daily, regardless of skin tone or weather.

## Related Terms

SPF: https://schoolofdermatology.com/glossary/spf
UVA: https://schoolofdermatology.com/glossary/uva
UVB: https://schoolofdermatology.com/glossary/uvb
Sunscreen: https://schoolofdermatology.com/glossary/sunscreen

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