Ask KBeauty Verified™

KBeauty Verified™ — K-beauty checked against official records from Korea, the EU and the U.S.

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Trimethylcyclopentenyl Methylisopentenol

Korean: 트라이메틸사이클로펜테닐메틸아이소펜텐올 · CAS 67801-20-1 · Functions: fragrance

KR South Korea (MFDS)

No specific rule on file.

EU European Union (CosIng)

Restricted Annex III/339

Conditions: The presence of the substance shall be indicated in the list of ingredients referred to in Article 19(1), point (g), when its concentration exceeds: — 0,001 % in leave-on products — 0,01 % in rinse-off products.

Source: EU CosIng — Annex III · checked Oct 16, 2026

US United States (FDA)

No specific rule on file. The FDA regulates few cosmetic ingredients by name; no rule does not mean approval.

Also listed as

Trimethylcyclopentenyl Methylisopentenol 트라이메틸사이클로펜테닐메틸아이소펜텐올

Information only, not medical advice. Rules change — always check the linked official source. If you are pregnant, have a skin condition or allergies, ask a dermatologist or pharmacist.

Frequently asked questions

Is Trimethylcyclopentenyl Methylisopentenol banned in the European Union?

In the EU's CosIng records it is listed as “Restricted” (EU CosIng — Annex III). A restricted ingredient is allowed within the stated conditions.

Is Trimethylcyclopentenyl Methylisopentenol banned in South Korea?

We found no specific rule for it in Korea's MFDS records. That is not an approval or a safety statement.

Is Trimethylcyclopentenyl Methylisopentenol allowed in cosmetics in the U.S.?

We found no specific rule for it in the FDA's records. That is not an approval or a safety statement.

What is Trimethylcyclopentenyl Methylisopentenol used for in cosmetics?

The EU's CosIng inventory lists its functions as: fragrance.

What is Trimethylcyclopentenyl Methylisopentenol called on Korean labels?

Korea's MFDS standard Korean name is 트라이메틸사이클로펜테닐메틸아이소펜텐올.

What is the CAS number of Trimethylcyclopentenyl Methylisopentenol?

CAS 67801-20-1 (from official records).