Food use
Food-use source coverage is present in the current record.
The ingredient appears in food-oriented source coverage or allowed-use references, which makes food use easier to support than a context with no domain signal at all.
METHYLISOTHIAZOLINONE
Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate is listed in Annex V of the EU Cosmetics Regulation (EC) 1223/2009 (preservatives allowed in cosmetic products).
Research docs0Claims0Sources9Functionpreservative • AntioxidantIdentifier26172-55-4
Concern score
25/100Minor concern based on regulatory listings.
Well researched
How we scored this
The concern value reflects this ingredient's chemical identity — its hazard profile from the published classifications and regulatory status below — not the safety of a product it appears in. A score near 40 is the baseline for ingredients with no specific signal (water scores 40 by design), so a mid-range value is not a safety verdict.
Concern score 25/100 (minor) · high confidence.
Where it appears
Prevalence of METHYLISOTHIAZOLINONE in our catalog (epa_cpdat).
Products
9,337
Brands
6
Construction and building materialsLaboratory suppliesCleaning and safetyRaw materialsHome maintenanceIndustrial products
Typical roles
preservativeAntioxidantBiocideFragrancePreservative
Catalog
Found in these products
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Good fit
Fragrance avoidance
Not a strong fit for fragrance avoidance because it carries Fragrance.
Linked research
Primary documents currently linked to this ingredient record.
No linked research documents are attached to this ingredient yet.
Extracted claims
Structured claim signals pulled from linked ingredient research.
No extracted claims are attached to this ingredient yet.
Regulatory status
Published jurisdiction-level classifications and regulatory designations for this ingredient.
EU
EC
Annex V of EU Cosmetics Regulation (EC) 1223/2009: preservatives allowed in cosmetic products. Product types: Rinse-off Maximum concentration: 0.0015% (of a mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one
Effective: 2022-09-28View source →
EU
EC
Annex V of EU Cosmetics Regulation (EC) 1223/2009: preservatives allowed in cosmetic products. Maximum concentration: 0,0015 % Rinse-off products
Effective: 2020-07-27View source →
US
EPA
