Moderate Cosmetic Ingredient NOAEL Data

2,6-Dihydroxy-3,4-Dimethylpyridine

INCI: 2,6-DIHYDROXY-3,4-DIMETHYLPYRIDINE

CAS Number
84540-47-6
Function
Hair Dyeing (coupler in oxidative hair dyes)
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status restricted
EU Max Conc. 1.0%
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Permitted under coal tar hair dye exemption

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
adequate
Dermal Absorption
moderate
Sensitization
moderate

Calculate MoS for your specific formulation with the MoS Calculator.

Toxicological Studies

2 study endpoints found for 2,6-Dihydroxy-3,4-Dimethylpyridine. NOAEL (No Observed Adverse Effect Level) values are used to calculate the Margin of Safety per SCCS methodology.

Endpoint Value Route Species Study Type Source
NOAEL 80 mg/kg bw/day oral rat Developmental COSMOS_DB
LOAEL 160 mg/kg bw/day oral rat Developmental COSMOS_DB

Expert Verdict

Hair dye use only; restricted to oxidative formulations; mixing ratio must be labeled

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Concern Level: Moderate

Regulatory Flags

eu_cosing_listed

Frequently Asked Questions

Is 2,6-Dihydroxy-3,4-Dimethylpyridine safe in cosmetics?

Hair dye use only; restricted to oxidative formulations; mixing ratio must be labeled The EU classifies 2,6-Dihydroxy-3,4-Dimethylpyridine as "restricted". Safety rating: MODERATE. 2 toxicological study endpoint(s) are available in our database.

Is 2,6-Dihydroxy-3,4-Dimethylpyridine allowed in the EU?

2,6-Dihydroxy-3,4-Dimethylpyridine EU regulatory status: restricted. Maximum allowed concentration: 1.0%. This is based on EU Regulation 1223/2009 and its amendments.

What does 2,6-Dihydroxy-3,4-Dimethylpyridine do in cosmetics?

2,6-Dihydroxy-3,4-Dimethylpyridine functions as: Hair Dyeing (coupler in oxidative hair dyes). It is classified as a cosmetic ingredient in our database. CAS number: 84540-47-6.

What is the Margin of Safety for 2,6-Dihydroxy-3,4-Dimethylpyridine?

adequate The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

What is the NOAEL for 2,6-Dihydroxy-3,4-Dimethylpyridine?

The NOAEL (No Observed Adverse Effect Level) for 2,6-Dihydroxy-3,4-Dimethylpyridine is 80 mg/kg bw/day based on a Developmental study via oral route in rat. A total of 2 study endpoints are available. Source: COSMOS_DB.

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