Ingredient profile
5-CHLORO-2-METHYL-4-ISOTHIAZOLIN-3-ONE
Raters disagreeCAS 26172-55-4
A common, well-characterized cosmetic ingredient; none of our lists flag it. Also written as 5-chloro-2-methyl-4-isothiazolin-3-one.
Raters don't agree. Here's where each one stands
Safe
Greenlens Ingredient Scan
Independent
Greenlens Precautionary Screen
Independent
Greenlens Tolerance Screen
Independent
Caution
Health Canada Ingredient Hotlist
Government
Concern
—
Where each list lands
Funding shown- Caution
Health Canada Ingredient Hotlist
Government
A potent sensitizer permitted only in combination with MI, in rinse-off products at a strict cap. (Health Canada Cosmetic Ingredient Hotlist)
- Safe
Greenlens Ingredient Scan
Independent
No EU-regulated hazard recognized for this ingredient.
- Safe
Greenlens Precautionary Screen
Also screened — not on these lists
- California Proposition 65
- US NTP Report on Carcinogens
- IARC Monographs
- ANSES Endocrine Disruptors
- EU Microplastics Restriction
- EU Harmonised Classification (CLP Annex VI)
Notes
- Health Canada Hotlist — restricted
