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Ingredient Dictionary
Skin Care Ingredient Dictionary
Easily find ratings for thousands of meticulously-researched ingredients.
How we rate ingredients
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About the Experts
Our team of experts has analyzed ingredient research for decades. They use the most up-to-date research to rate ingredients based on the criteria below.
Ingredient Ratings
BEST
Outstanding ingredients with true benefits for skin. Proven and supported by independent studies.
GOOD
Includes non-irritating, effective ingredients. Not quite as beneficial as BEST ingredients, but often necessary to improve a formula’s texture, stability, or penetration.
AVERAGE
May have aesthetic, stability, or other issues that limit its usefulness. Sometimes, it’s just a no-frills ingredient or ingredient that doesn’t have much research behind it yet.
BAD
There is a likelihood of irritation. Risk increases when combined with other problematic ingredients. May offer some benefits to skin but overall, proven or highly likely to do more harm than good.
WORST
Proven to cause irritation, inflammation, dryness, etc. An ingredient in this category should be avoided, especially when used in high concentrations or combined with other irritants.
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.
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