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Best known as ginger, this plant can have soothing an antioxidant activity, but its oil form can be sensitising.
From a plant native to Szechuan Province in China. Szechuan pepper is known for the "numbing" sensation it produces on the tongue.
A plant native to Szechuan Province in China. The Szechuan pepper that comes from it is known for the "numbing" sensation it produces on the tongue.
This oil derived from the prickly ash plant has some beneficial properties but can also irritate skin.
Plant extract that can deliver antioxidant properties but is also sensitising if used repeatedly because it denatures proteins that help keep skin healthy.
A type of mint that is often used for addressing the discomfort of sore muscles but can also be very sensitising to skin.
Plant that can be irritating due to its tannin content, which causes skin constriction.
Extract that has weak antioxidant properties. May be a potential skin sensitizer.
Derived from the leaf or flower of the thyme plant. It can have potent antioxidant properties but may also cause skin sensitivity due to fragrant components.
Extract of wild thyme.
Extract derived from the leaf or flower of the thyme plant. It can have potent antioxidant properties but may also cause skin sensitivity due to fragrant components.
Fragrant essential oil (also known as blue tansy) that poses a risk of sensitizing skin.
This chemical element’s antimicrobial and anti-inflammatory properties are used to treat many skin issues.
Reducing agent that alters the structure of hair. It can also be used as a preservative in cosmetic formulations, and can be a skin sensitizer.
An inorganic salt that has no known function in cosmetics.
Metallic element that in cosmetics can have disinfecting properties; however, prolonged contact can turn skin grayish blue. Silver can be sensitising to skin.
Denatured alcohol used as a solvent. It can be drying and sensitising to skin when one of the main ingredients in the formula.
Also called costus oil. Volatile oil and fragrant component used in cosmetics; it can be a skin sensitizer.
Plant extract that contains components that function as antioxidants. There is some potential for sensitivity with sage extracts, but the risk is relatively low at the amounts used in topical skin care products.
Like all plant extracts, this contains components that function as antioxidants. There is some potential for sensitivity with sage extracts, but the risk is relatively low at the amounts used in topical skincare products.
Extract that can have antioxidant properties, although it also may have harmful components 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.
We couldn't find this in our ingredient dictionary. We log all missing ingredients and make continuous updates.
We have not yet rated this ingredient because we have not had a chance to review the research on it.