Glossary

Nano vs Non-Nano

Written by Reviewed by the SYNC editorial team Published Last reviewed Editorial standards

Nano vs Non-Nano — a distinction based on particle size in mineral sunscreens, where nano particles measure under 100 nanometers and non-nano particles are larger. The size affects how transparent the product appears on skin, with non-nano formulas tending to leave more visible white cast while nano versions blend more sheerly.

Key points

  • Nano particles are smaller than 100 nanometers, giving mineral sunscreens a lighter, less chalky finish.
  • Non-nano zinc oxide and titanium dioxide are larger and often preferred by those seeking a more visible mineral barrier.
  • Current evidence indicates nanoparticles in sunscreens do not penetrate healthy, intact skin into the bloodstream.
  • Both types provide UV protection, and the choice is largely about cosmetic feel and personal preference.

Frequently asked

Are nano sunscreens safe to use?

Available research indicates that mineral nanoparticles remain on the skin's surface and do not penetrate healthy intact skin, though inhalation of loose sprays is best avoided.

Why do non-nano sunscreens leave a white cast?

Larger non-nano mineral particles scatter more visible light, which produces the characteristic white appearance on the skin.

Related topics

This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.

Encyclopedia

Further reading

This entry was written and checked against the sources below. They are published by clinical and scientific bodies, they are listed most readable first, and each one opens in a new tab. They are background for the whole entry rather than footnotes to individual sentences.

  1. Introduction to Sunscreens and Their UV Filters - Review of Fate, Exposure, and Effects of Sunscreens in Aquatic Environments and Implications for Sunscreen… StatPearls (NCBI Bookshelf) Reference text ncbi.nlm.nih.gov
  2. Questions and Answers: FDA posts deemed final order and proposed order for over-the-counter sunscreen U.S. FDA Regulatory and safety fda.gov
  3. Sunscreen: How to Help Protect Your Skin from the Sun U.S. FDA Regulatory and safety fda.gov
  4. Ultraviolet Filters: Dissecting Current Facts and Myths PubMed Central Peer-reviewed, open access pmc.ncbi.nlm.nih.gov
  5. A short review of alternative ingredients and technologies of inorganic UV filters PubMed Peer-reviewed (abstract) pubmed.ncbi.nlm.nih.gov
  6. Synergy effects between organic and inorganic UV filters in sunscreens PubMed Peer-reviewed (abstract) pubmed.ncbi.nlm.nih.gov

SYNC does not publish medical advice. Nothing here replaces a consultation with a doctor or a pharmacist about your own skin.