Ask KBeauty Verified™

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

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Pyrrolidinyl Diaminopyrimidine Oxide

Korean: 피롤리디닐다이아미노피리미딘옥사이드 · CAS 55921-65-8 · Functions: hair conditioning, hair waving or straightening

KR South Korea (MFDS)

Prohibited MFDS prohibited ingredients

Conditions (official MFDS text, Korean):
Pyrrolidinyl Diaminopyrimidine Oxide is the heterocyclic compound that conforms to the formula

Source: MFDS — cosmetic ingredient use restrictions · checked Oct 16, 2026

EU European Union (CosIng)

No specific rule on file.

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

PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE 피롤리디닐다이아미노피리미딘옥사이드

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 Pyrrolidinyl Diaminopyrimidine Oxide banned in the European Union?

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

Is Pyrrolidinyl Diaminopyrimidine Oxide banned in South Korea?

In Korea's MFDS records it is listed as “Prohibited” (MFDS — cosmetic ingredient use restrictions).

Is Pyrrolidinyl Diaminopyrimidine Oxide 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 Pyrrolidinyl Diaminopyrimidine Oxide used for in cosmetics?

The EU's CosIng inventory lists its functions as: hair conditioning, hair waving or straightening.

What is Pyrrolidinyl Diaminopyrimidine Oxide called on Korean labels?

Korea's MFDS standard Korean name is 피롤리디닐다이아미노피리미딘옥사이드.

What is the CAS number of Pyrrolidinyl Diaminopyrimidine Oxide?

CAS 55921-65-8 (from official records).