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SPF

Best

UV filter

SPF 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 Europe the SPF factor is calculated according to ISO 24444.. 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.

Related ingredients: Sun Protection Factor

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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

Best

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

Good

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

Average

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

Bad

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

Worst

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

unknown

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

Not rated

We have not yet rated this ingredient because we have not had a chance to review the research on it.