Non-nano zinc oxide: a particle description, not an SPF rating

Particle size can affect a material’s behavior

FDA’s nanotechnology report explains that properties can change as material dimensions become very small. In sunscreen discussions, nano and non-nano language concerns the zinc oxide particles, not a different dietary form of zinc. The wording alone does not describe every aspect of the formulation or its testing. [1]

Use protection claims that refer to the complete product

FDA explains that SPF and broad-spectrum labeling address the performance of the sunscreen. A non-nano claim does not assign an SPF, demonstrate water resistance or prove superiority over another formula. Check the active ingredients, broad-spectrum designation and directions on the actual product. [2]

Apply enough of a formulation you can use consistently

Imagine a non-nano lotion leaves a visible film and a reader uses much less to hide it. The particle claim cannot compensate for using a product contrary to its directions. Compare suitable finished formulations and maintain other sun-protection measures instead of making appearance the only selection criterion. [2]

Hypothetical example — identify the preparation before interpreting its purpose
Name or claim	What it means
Non-nano wording	Particle-size description
SPF and broad spectrum	Finished-product protection information
Visible white film	Not a direct measure of protection

Non-nano zinc oxide: a particle description, not an SPF rating — original article outline diagram — Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

Sources for this article

Nanotechnology Task Force Report 2007 | FDA
Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.
Sunscreen: How to Help Protect Your Skin from the Sun | FDA
Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.