The ones people ask about
Diazolidinyl Urea
Diazolidinyl urea is a preservative that works by slowly releasing tiny amounts of formaldehyde, which keeps the product free of bacteria and mould.
Without diazolidinyl ureaLe Masque d'Argile · $64
- On a list as
- Diazolidinyl Urea
- What it does
- Preservative (a formaldehyde releaser)
- Where it comes from
- Synthetic
- Vegan?
- Yes
Why it’s in a formula
It is an effective, broad-spectrum preservative, used at low concentrations.
- Formaldehyde releasers are permitted in cosmetics at low levels in the EU and the US, but they are a known cause of contact allergy. If you’re allergic to formaldehyde or its releasers, avoid the pieces below.
- The list doesn’t state the concentration, and we can’t tell you it.
Without diazolidinyl urea
Formaldehyde-free, by their own published lists.
Every piece without a formaldehyde releaser · first order: FOUNDING15 takes 15% off, ends 31 Dec 2026
Where you’ll find it at Divina
Read from each piece’s published ingredient list. 3 pieces.
Questions
Is diazolidinyl urea safe?
It is permitted at low concentrations, and most people use it without problems. It is a known allergen for some people, especially those sensitive to formaldehyde.
Does diazolidinyl urea contain formaldehyde?
It releases small amounts of formaldehyde over time; that is how it preserves.
How we know: every ingredient list on this site is the manufacturer’s own, read piece by piece and shade by shade, and the pieces above are worked out from those lists each time the site is built. Ingredient names and functions follow the EU’s CosIng database. This page describes cosmetic ingredients; it isn’t medical advice.
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