Sunscreen vs Sunblock: Is There a Difference?
By Dr. Erah Anwar, PhD — skin scientist · Last updated 12 July 2026
In practice they're two words for the same thing: a product that protects your skin from UV. There's no meaningful ingredient difference. In fact, since 2011 the U.S. FDA no longer permits the term "sunblock" on labels, because no product truly blocks all UV and the word overstates protection.[1]
Why "sunblock" was retired. Along with "sunblock," the FDA also banned "waterproof" and "sweatproof" — all three exaggerate what a sunscreen can do.[1] Every sunscreen eventually washes, sweats, or rubs off, and none blocks 100% of UV. Products can now only claim to be water resistant for a tested 40 or 80 minutes.
A common mix-up. Many people assume "sunblock" means a mineral (zinc/titanium) product and "sunscreen" means a chemical one. That was never an official rule — plenty of old mineral *and* chemical products were marketed as "sunblock." If you want to know what a product actually uses, check its ingredient list.
What to look for instead of the name. Three things on the label matter far more than "screen" vs "block":
- Broad spectrum — protects against both UVA (ageing, deeper damage) and UVB (burning). To earn this label a product must pass a test showing a critical wavelength of at least 370 nm.[1]
- SPF 30 or higher — SPF measures UVB protection; 30+ is the usual dermatology recommendation.
- Water resistant (40 or 80 min) — if you'll sweat or swim.
Bottom line: don't get hung up on "sunscreen" vs "sunblock" — they're the same category, and one of the words isn't even allowed on US shelves anymore. Look for broad-spectrum, SPF 30+, and reapply.
References
- U.S. Food & Drug Administration. Labeling and Effectiveness Testing: Sunscreen Drug Products for Over-the-Counter Human Use (Final Rule, 2011); 21 CFR 201.327.
This article is general education about sunscreen science, not medical advice. For a skin condition, allergy, or reaction, please see a dermatologist.