Moderate Cosmetic Ingredient NOAEL Data

2,6-Dimethoxy-3,5-Pyridinediamine HCl

INCI: 2,6-DIMETHOXY-3,5-PYRIDINEDIAMINE HCL

CAS Number
56216-28-5
Function
Hair Dyeing (oxidative hair dye coupler)
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status restricted
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)
not established
Dermal Absorption
moderate
Sensitization
low

Calculate MoS for your specific formulation with the MoS Calculator.

Toxicological Studies

2 study endpoints found for 2,6-Dimethoxy-3,5-Pyridinediamine 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 5 mg/kg bw/day oral rat Subchronic COSMOS_DB
LOAEL 15 mg/kg bw/day oral rat Subchronic COSMOS_DB

Expert Verdict

Confirmed skin sensitizer with EC3 exceeding LLNA threshold; no skin irritation at 3% aqueous dilution.

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Concern Level: Moderate

Regulatory Flags

potential-allergen

Frequently Asked Questions

Is 2,6-Dimethoxy-3,5-Pyridinediamine HCl safe in cosmetics?

Confirmed skin sensitizer with EC3 exceeding LLNA threshold; no skin irritation at 3% aqueous dilution. The EU classifies 2,6-Dimethoxy-3,5-Pyridinediamine HCl as "restricted". Safety rating: MODERATE. 2 toxicological study endpoint(s) are available in our database.

Is 2,6-Dimethoxy-3,5-Pyridinediamine HCl allowed in the EU?

2,6-Dimethoxy-3,5-Pyridinediamine HCl EU regulatory status: restricted. This is based on EU Regulation 1223/2009 and its amendments.

What does 2,6-Dimethoxy-3,5-Pyridinediamine HCl do in cosmetics?

2,6-Dimethoxy-3,5-Pyridinediamine HCl functions as: Hair Dyeing (oxidative hair dye coupler). It is classified as a cosmetic ingredient in our database. CAS number: 56216-28-5.

What is the Margin of Safety for 2,6-Dimethoxy-3,5-Pyridinediamine HCl?

not established 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-Dimethoxy-3,5-Pyridinediamine HCl?

The NOAEL (No Observed Adverse Effect Level) for 2,6-Dimethoxy-3,5-Pyridinediamine HCl is 5 mg/kg bw/day based on a Subchronic study via oral route in rat. A total of 2 study endpoints are available. Source: COSMOS_DB.

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