Ingredient decoder

Diazolidinyl urea: is it comedogenic? What it does in skincare

INCI name: Diazolidinyl Urea

Acne verdict Watch

Worth watching on acne-prone skin

  • ComedogenicNo published rating
  • IrritancyNo published rating

What it does

Preservative that slowly releases formaldehyde.

  • Preservative

Diazolidinyl urea in plain English

Diazolidinyl urea is a preservative that slowly releases small amounts of formaldehyde to keep bacteria from growing. It releases more than imidazolidinyl urea. Some people are allergic to formaldehyde, so ingredients that release it are among the more common causes of preservative allergies. It does not clog pores, but if you have reactive skin or a known formaldehyde allergy, it is worth avoiding.

Is diazolidinyl urea bad for acne?

Not usually, but it is worth watching. Diazolidinyl urea is not a proven pore-clogger, but this preservative family is a well-known cause of skin allergies and irritation. Notice how your skin reacts when a product lists it near the top.

Clean routine and still breaking out? The cause may be internal. See what is driving it

Also called

  • Diazolidinyl Urea
  • Diazolidinylurea
  • Diazolidinyl carbamide

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Frequently asked questions

Is diazolidinyl urea comedogenic?

Diazolidinyl urea has no published comedogenic rating in Fulton's 1989 table. It is not a proven pore-clogger, but it is worth watching on acne-prone skin.

What does diazolidinyl urea do in skincare?

In short: preservative that slowly releases formaldehyde. In formulas it is used for preservative.

What else is diazolidinyl urea called on ingredient labels?

On ingredient lists, diazolidinyl urea can also appear as Diazolidinylurea or Diazolidinyl carbamide.

Sources