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Fragrant, volatile oil that can be a skin sensitizer.
Group of volatile fluids derived primarily from plants and used in cosmetics primarily as fragrant.
Plant that may offer some beneficial properties but can also be a skin sensitizer due to fragrant components (depending on which part of the plant was used).
Fragrant component in skincare products that also has some beneficial properties.
Antioxidant-rich plant extract that’s iffy for skin due to volatile fragrance compounds.
Fragrant extract that can be a skin sensitizer.
More commonly known as thyme oil. Like most fragrant plant oils, thyme is a source of potent antioxidants but its fragrant components (which are part of the oil itself) pose a risk of sensitivity.
Source of potent antioxidants, but its fragrant components (which are part of the oil itself) pose a risk of sensitivity.
Tea tree oil contains volatile components (such as linalool, limonene, and eucalyptol) that can be sensitising to skin.
Fragrant, volatile citrus oil that can be a skin sensitizer.
Styrax benzoin resin extract is a plant-derived ingredient used as a perfuming agent in cosmetics. It’s capable of sensitizing skin.
Styrax benzoin is a family of trees that generates aromatic cosmetic ingredients that can sensitize skin.
Also known as aniseed, it can have antioxidant properties, but its fragrant components make this a potential skin sensitizer.
Fragrant, volatile oil that can cause skin sensitivity.
Essential oil whose fragrant compounds pose a risk of irritation to skin.
Fragrance ingredient with a musky/woody aroma; may be problematic for skin.
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.
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We have not yet rated this ingredient because we have not had a chance to review the research on it.