Good Fragrance NOAEL Data Sensitization Data Dermal Penetration

Alpha-Isomethyl Ionone

INCI: ALPHA-ISOMETHYL IONONE

CAS Number
127-51-5
Function
Fragrance ingredient
Safety Rating
GOOD

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status permitted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted

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 Alpha-Isomethyl Ionone. 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 4.1 mg/kg bw/day oral rat Subchronic COSMOS_DB
dose_tested 4.1 mg/kg bw/day oral rat Subchronic COSMOS_DB

Sensitization Profile

Contact sensitization data for Alpha-Isomethyl Ionone based on clinical patch test studies and IFRA standards.

Sensitization Rate
low
Allergen Class
fragrance
EU Allergen Listed
yes
Patch Test Positive Rate
0.5%
Cross-reactivity Group
fragrance-mix-II
Reaction Type
contact-dermatitis
IFRA Restricted

Source: ESSCA/IVDK

Dermal Penetration Profile

Skin absorption and penetration characteristics of Alpha-Isomethyl Ionone, relevant to systemic exposure and MoS calculations.

Absorption %
15-25%
Penetration Level
epidermis
Penetration Depth
epidermis
Molecular Weight
206.3 Da
Log P
3.9
Systemic Absorption
yes
Topical Bioavailability
10-20%
Safety Margin Factor
high
Vehicle Dependent
Yes โ€” absorption varies by formulation

Source: SCCS/1459/11, IFRA

Expert Verdict

Good safety profile. Generally considered safe for cosmetic use.

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Concern Level: Low

Regulatory Flags

eu_children_restricted ifra_fragrance fda_food_additive eu_cosing_listed

Frequently Asked Questions

Is Alpha-Isomethyl Ionone safe in cosmetics?

Good safety profile. Generally considered safe for cosmetic use. The EU classifies Alpha-Isomethyl Ionone as "permitted". Safety rating: GOOD. 2 toxicological study endpoint(s) are available in our database.

Is Alpha-Isomethyl Ionone allowed in the EU?

Alpha-Isomethyl Ionone EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.

What does Alpha-Isomethyl Ionone do in cosmetics?

Alpha-Isomethyl Ionone functions as: Fragrance ingredient. It is classified as a Fragrance in our database. CAS number: 127-51-5.

What is the Margin of Safety for Alpha-Isomethyl Ionone?

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 Alpha-Isomethyl Ionone?

The NOAEL (No Observed Adverse Effect Level) for Alpha-Isomethyl Ionone is 4.1 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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