Ingredient profile
METHYLCHLOROISOTHIAZOLINONE / METHYLISOTHIAZOLINONE
Raters disagreeCAS 26172-55-4
At least one of our safety lists speaks to this ingredient. Also written as METHYLCHLOROISOTHIAZOLINONE & METHYLISOTHIAZOLINONE, Methylchloroisothiazolinone + Methylisothiazolinone, Methylchloroisothiazolinone/Methylisothiazolinone…
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
EU Harmonised Classification (CLP Annex VI)
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)
- Caution
EU Harmonised Classification (CLP Annex VI)
Government
Carries an EU harmonised classification (Skin Sens. 1A) — a skin sensitiser under CLP Annex VI, index 613-326-00-9. A hazard classification, not proof of harm at the level used. (EU CLP Regulation Annex VI, Table 3 (harmonised classification, ECHA export))
- Safe
Also screened — not on these lists
- California Proposition 65
- US NTP Report on Carcinogens
- IARC Monographs
- ANSES Endocrine Disruptors
- EU Microplastics Restriction
Where regulators stand
Shown side by side, never combinedEach jurisdiction is reported on its own terms, from its own official lists. Where they disagree, that disagreement is the finding. Absence from a list is never a safety claim.
European Union
FlaggedCarries a formal hazard classification. Not itself a cosmetic use rule.
- ECHA (EU CLP Regulation) · EU CLP Regulation Annex VI, Table 3 (harmonised classification, ECHA export): Skin Sens. 1ACarries an EU harmonised classification (Skin Sens. 1A) — a skin sensitiser under CLP Annex VI, index 613-326-00-9. A hazard classification, not proof of harm at the level used.
Canada
RestrictedAllowed only under stated conditions or limits.
- Health Canada · Health Canada Cosmetic Ingredient HotlistA potent sensitizer permitted only in combination with MI, in rinse-off products at a strict cap.
Notes
- EU harmonised skin sensitizer
- Health Canada Hotlist — restricted
