Is Methylcyclopentenolone (Maple Lactone / MCP) safe in cosmetics?
Methylcyclopentenolone (Maple Lactone / MCP) has a safety rating of "MODERATE" in our database. EU status: permitted. US status: permitted.
MODERATE
Cosmetic Ingredient
Methylcyclopentenolone (Maple Lactone / MCP)
Also known as: 1,2-Cyclopentanedione, 3-methyl-, EINECS 212-154-8, FEMA No. 2700
INCI: METHYLCYCLOPENTENOLONE
Methylcyclopentenolone (Maple Lactone / MCP) (CAS 765-70-8) is a cosmetic cosmetic ingredient functioning as Fragrance. EU Regulation 1223/2009 status: permitted. Industrial safety data is also available in the chemical safety database. Same-CAS public records also appear in industrial chemical safety data.
Function
Fragrance
Editorial assessment
MODERATE
Preliminary editorial note — not a computed safety verdict.
Chemistry & Identifiers
IUPAC Name
3-methylcyclopentane-1,2-dione
InChIKey
OACYKCIZDVVNJL-UHFFFAOYSA-N
Regulatory Status
EU EU Status
permitted
US US Status
permitted
US Notes
Allowed - also FEMA GRAS (Generally Recognized as Safe) for flavoring applications
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for Methylcyclopentenolone (Maple Lactone / MCP).
Calculate MoS for your specific formulation with the MoS Calculator.
HRIPT Human Patch Test Studies
1 human repeat insult patch test aggregated from dermatological literature.
| Test Type | N | Sensitized | Dose µg/cm² | NESIL µg/cm² | Potency |
|---|---|---|---|---|---|
| HMT | - | 0 | 2025 | - | - |
Function Categories & List Membership
Cosmetic/Chemical Function Categories
Flavouring and nutrient
Fragrance
No specific technical function
Regulatory List Membership (3)
IFRA Fragrance Transparency List
FDA Substances Added to Food (EAFUS)
Consumer Product Chemical
Editorial summary
Preliminary editorial summary for Methylcyclopentenolone (Maple Lactone / MCP) — not a computed safety verdict. See the sourced toxicological data above.
Regulatory Flags
fragrance-component
ifra_fragrance
fda_food_additive
Known Synonyms
1,2-Cyclopentanedione, 3-methyl-
EINECS 212-154-8
FEMA No. 2700
Chemical Function
No specific technical function
Fragrance
Flavouring and nutrient
Regulatory Lists
Cleaning products and household care - air freshener; Europe
IFRA Transparency
Australia; Food and drug - smoking-related products
food_additive; Substances Added to Food (formerly EAFUS) (2/2019)
consumer_product
Australian Status
AICIS status: listed
Frequently Asked Questions
Is Methylcyclopentenolone (Maple Lactone / MCP) allowed in the EU?
Methylcyclopentenolone (Maple Lactone / MCP) EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.
What does Methylcyclopentenolone (Maple Lactone / MCP) do in cosmetics?
Methylcyclopentenolone (Maple Lactone / MCP) functions as: Fragrance. It is classified as a cosmetic ingredient in our database. CAS number: 765-70-8.
Is Methylcyclopentenolone (Maple Lactone / MCP) used outside cosmetics?
Methylcyclopentenolone (Maple Lactone / MCP) also appears in industrial chemical safety data. The cross-vertical cards on this page render same-CAS public rows from the matched databases.
Compliance Tools
Check Methylcyclopentenolone (Maple Lactone / MCP) compliance across multiple jurisdictions:
Ingredient Decoder
Paste a full ingredient list for instant analysis
82 Allergen Checker
Check for EU declarable fragrance allergens
Substance Compliance
Check compliance across multiple jurisdictions
MoS Calculator
Calculate Margin of Safety using SCCS methodology
Heavy Metal Limits
Compare limits across jurisdictions
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Film Forming
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