Moderate Cosmetic Ingredient NOAEL Data

2,4-Diaminophenoxyethanol HCl

INCI: 2,4-DIAMINOPHENOXYETHANOL HCL

CAS Number
66422-95-5
Function
Oxidative hair dye (primary intermediate/coupler)
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status restricted
EU Max Conc. 2.0%
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes CIR: Safe as a cosmetic ingredient in hair dyes as practiced

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

Safety Data

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

Calculate MoS for your specific formulation with the MoS Calculator.

Toxicological Studies

5 study endpoints found for 2,4-Diaminophenoxyethanol HCl. 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 4 mg/kg bw/day oral rat Subchronic COSMOS_DB
LOAEL 20 mg/kg bw/day oral rat Subchronic COSMOS_DB
NOAEL 20 mg/kg bw/day oral rat Developmental COSMOS_DB
LOAEL 125 mg/kg bw/day oral rat Developmental COSMOS_DB
NOAEL 20 mg/kg bw/day oral rat oral REACH

Expert Verdict

Concentration limits strictly enforced; eyelash dye use limited to professionals; must carry "Can cause allergic reaction" label

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Concern Level: Moderate

Frequently Asked Questions

Is 2,4-Diaminophenoxyethanol HCl safe in cosmetics?

Concentration limits strictly enforced; eyelash dye use limited to professionals; must carry "Can cause allergic reaction" label The EU classifies 2,4-Diaminophenoxyethanol HCl as "restricted". Safety rating: MODERATE. 5 toxicological study endpoint(s) are available in our database.

Is 2,4-Diaminophenoxyethanol HCl allowed in the EU?

2,4-Diaminophenoxyethanol HCl EU regulatory status: restricted. Maximum allowed concentration: 2.0%. This is based on EU Regulation 1223/2009 and its amendments.

What does 2,4-Diaminophenoxyethanol HCl do in cosmetics?

2,4-Diaminophenoxyethanol HCl functions as: Oxidative hair dye (primary intermediate/coupler). It is classified as a cosmetic ingredient in our database. CAS number: 66422-95-5.

What is the Margin of Safety for 2,4-Diaminophenoxyethanol HCl?

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 2,4-Diaminophenoxyethanol HCl?

The NOAEL (No Observed Adverse Effect Level) for 2,4-Diaminophenoxyethanol HCl is 4 mg/kg bw/day based on a Subchronic study via oral route in rat. A total of 5 study endpoints are available. Source: COSMOS_DB.

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