Sun Protection Factor


UV filter

Sun Protection Factor description

Most commonly seen as SPF followed by a number, it is a rating system assigned to a product that identifies the amount of time it can protect the skin from sunburn or from turning pink or red when exposed to sun. In the United States, SPF ratings are regulated by the Fod & Drug Administration. Because sunburn results from UVB radiation, not UVA radiation, SPF is primarily a measure of UVB protection; however, sunscreens rated for broad spectrum protection can protect from UVA rays, too.

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


We couldn't find this in our ingredient dictionary. We log all missing ingredients and make continuous updates.

Not rated