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About this allergen

Methyl 2-octynoate has a concentration limit as well as a declaration duty, and the limit is shared: it counts together with methyl octine carbonate toward a combined 0.01%.

  • Annex III entry 89: 0.01% when used alone.
  • In combination with methyl octine carbonate the two together must not exceed 0.01%.
  • Within that combined figure, methyl octine carbonate may be no more than 0.002%.
  • Declaration thresholds apply as well: 0.001% leave-on, 0.01% rinse-off.

Most declared allergens carry a labelling duty and nothing more. This one carries a real concentration limit as well, and the limit is unusual in being shared with a substance that is not on the allergen list at all.

Used by itself, methyl 2-octynoate is capped at 0.01%. Used alongside methyl octine carbonate — a closely related material with the same violet-leaf character — the two are counted together against the same 0.01%, with a further sub-limit of 0.002% on the carbonate. A formula respecting each figure individually can still be over, which is the point of writing the limit as a combination.

The declaration thresholds sit alongside this and are lower: 0.001% in a leave-on product, 0.01% in a rinse-off one. So in a leave-on product the substance must be named on the label at a tenth of the concentration at which it becomes non-compliant.

Checked against

EU AllergenCAS 111-12-6

METHYL 2-OCTYNOATE — EU Regulated Fragrance Allergen

Methyl caprylate-2-yne

METHYL 2-OCTYNOATE is included in this site's EU fragrance-allergen reference set. The general declaration threshold is above 0.001% in leave-on products or above 0.01% in rinse-off products, but any linked Annex II or III conditions also apply.

This page links METHYL 2-OCTYNOATE to 1 annex record in the EU cosmetics dataset. Declared on the label when present above 0.001% in leave-on products or 0.01% in rinse-off products under EU Cosmetics Regulation 1223/2009 Annex III.

Leave-on products
> 0.001%
Label declaration required
Rinse-off products
> 0.01%
Label declaration required
Check your formula for this allergen All allergens View annex entries for this CAS

Regulatory status

INCI name

METHYL 2-OCTYNOATE

CAS number

111-12-6

Synonyms

Methyl caprylate-2-yne

Declaration requirement

Must be declared on the cosmetic product label when present above 0.001% in leave-on products or above 0.01% in rinse-off products.

Legal basis

EU Cosmetics Regulation 1223/2009, Annex III

Additional chemical sources

Search the same identity in independent official chemistry and hazard databases. These sources provide context and do not replace the EU labelling rule above.

ECHA CHEM

EU substance information and CLP classification where available.

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US EPA CompTox

EPA chemistry, exposure and toxicity data search.

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Annex records for METHYL 2-OCTYNOATE

Annex
III
Entry 89

Methyl 2-Octynoate

Max concentration: (b) 0.01% when used alone When present in combination with methyl octine carbonate, the combined level in the finished product shall not exceed 0,01 % (of which methyl octine carbonate shall not be more than 0,002 %)

Allergen

Why METHYL 2-OCTYNOATE matters for EU labelling

METHYL 2-OCTYNOATE has a dedicated fragrance-labelling reference page and currently links to 1 annex record. Regulation (EU) 2023/1545 also added 56 allergens and updated existing entries, so current Annex III evidence remains authoritative.

Declared on the label when present above 0.001% in leave-on products or 0.01% in rinse-off products under EU Cosmetics Regulation 1223/2009 Annex III.

Allergen declaration is a labelling obligation, not an automatic ban. If additional Annex II or Annex III conditions apply through the linked records above, those conditions must be checked separately from the label declaration thresholds.

Frequently asked questions

METHYL 2-OCTYNOATE is included in the fragrance-allergen labelling reference. A labelling rule does not by itself establish that an ingredient is permitted: an Annex II prohibition or additional Annex III restriction may also apply. Check every linked current annex record above.

Declaration of METHYL 2-OCTYNOATE is mandatory when the concentration exceeds 0.001% (10 ppm) in leave-on cosmetic products or 0.01% (100 ppm) in rinse-off products. Below these thresholds, label declaration is not required but may be made voluntarily.

The concentration threshold applies to the allergen in the finished product. When the allergen is contributed by a fragrance blend, the allergen content of the blend (provided by the fragrance supplier) must be multiplied by the percentage of blend used in the formula. If the calculated total allergen concentration exceeds the threshold, it must be declared on the label.

Use the INCI Checker to paste your ingredient list. It checks dedicated allergen references including METHYL 2-OCTYNOATE and scans all Annex II–VI entries, including the expanded Annex III records introduced or updated under Regulation (EU) 2023/1545.
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CAS 111-12-6 identifies METHYL 2-OCTYNOATE in the EU regulatory databases. The annex records linked above show all Annex II–VI entries that share this CAS number, including any additional restriction or prohibition conditions beyond the allergen labelling requirement.

Source note for METHYL 2-OCTYNOATE

This page combines the EU allergen-labelling rule for METHYL 2-OCTYNOATE with 1 linked Annex II–VI record drawn from the current local dataset.

Use this page to review labelling logic for METHYL 2-OCTYNOATE, but verify any final compliance decision against the current official allergen rules, annex text and source files.

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Tools & next steps

Check your formula

Scan a full INCI list for METHYL 2-OCTYNOATE, the other EU allergens and any linked annex restrictions.

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Allergen references

Browse the site's dedicated allergen references and continue to the complete current Annex III records from METHYL 2-OCTYNOATE.

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Calculate the threshold

Calculate the finished-product level of METHYL 2-OCTYNOATE contributed by a fragrance or raw-material blend.

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Annex entries by CAS

View all EU annex records sharing CAS 111-12-6.

View CAS records