Ingredients with a documented concern, from official datasets and our reviewed database.
Sensitive skin: High cautionPregnancy: Use with cautionBabies & kids: Best avoidedEczema-prone: Best avoided
- Cancer concern:Slowly releases formaldehyde, an IARC Group 1 carcinogen.
- Allergy risk:Frequent cause of preservative contact dermatitis.
A formaldehyde-releasing preservative used in creams, shampoos and wipes. The slow formaldehyde release preserves the product but exposes skin to a known carcinogen and allergen.
Sensitive skin: Best avoidedPregnancy: Use with cautionBabies & kids: Best avoidedEczema-prone: Best avoided
- Allergy risk:Fragrance is the single most common cause of cosmetic contact allergy.
- Irritation:Frequent trigger of stinging and redness on reactive skin.
Caredermis curated dermatological review
An umbrella term that can hide dozens of undisclosed scent chemicals. Fragrance is the leading cause of allergic contact dermatitis from cosmetics, and dermatologists routinely advise fragrance-free products for eczema, babies and sensitive skin.
Sensitive skin: Best avoidedPregnancy: Use with cautionBabies & kids: Best avoidedEczema-prone: Best avoided
- Allergy risk:Potent sensitizer, typically blended with MIT (Kathon CG).
- Irritation:Corrosive in concentrate; irritating at use levels.
Caredermis curated dermatological review
The chlorinated partner of MIT, restricted in the EU to rinse-off products only. A leading cause of preservative contact dermatitis worldwide.
Sensitive skin: Best avoidedPregnancy: Use with cautionBabies & kids: Best avoidedEczema-prone: Best avoided
- Allergy risk:Caused an epidemic of contact allergy; banned in EU leave-on products.
- Irritation:Irritating even in people without allergy.
A preservative behind one of the largest contact-allergy epidemics in cosmetic history. The EU banned it from leave-on products and restricts it in rinse-off products to 15 ppm.
surfactant · foaming agent
Severity 4/10EditorialSensitive skin: High cautionDry skin: Use with cautionBabies & kids: Use with cautionEczema-prone: High caution
- Irritation:Milder than SLS but still drying for compromised skin.
The gentler cousin of SLS used in most mainstream shampoos and washes. Its manufacturing can leave trace 1,4-dioxane, which reputable makers strip out — an issue of quality control rather than the ingredient itself.
Sensitive skin: Use with cautionEczema-prone: High caution
- Allergy risk:American Contact Dermatitis Society Allergen of the Year 2018.
- Irritation:Can irritate compromised skin at higher concentrations.
A workhorse humectant and penetration enhancer that is fine for most, but a recurring culprit in eczema patients' patch tests.
Sensitive skin: Use with cautionEczema-prone: Use with caution
- Allergy risk:Named Allergen of the Year 2004; impurities (amidoamine) drive most reactions.
A mild coconut-derived surfactant in countless 'gentle' cleansers. Most allergy is caused by manufacturing impurities, so quality varies by brand.
Sensitive skin: Use with cautionEczema-prone: Use with caution
- Allergy risk:EU-declarable fragrance allergen.
A rose-type scent component on the EU's mandatory-declaration allergen list.
Sensitive skin: Use with cautionBabies & kids: Use with cautionEczema-prone: Use with caution
- Irritation:Milder than glycolic; still increases photosensitivity.
A gentler AHA that exfoliates and hydrates simultaneously; the usual pick for drier or more reactive skin starting acids.
- Environmental impact:Synthetic polymer counted as a microplastic under the EU restriction when in particle form.
A common film-forming polymer scrutinized under the EU's microplastics restriction; skin safety itself is well established.
- Environmental impact:Poorly biodegradable; can remobilize heavy metals in waterways.
A metal-binding stabilizer that is safe on skin at the tiny amounts used; its criticism is environmental persistence.