DMDM Hydantoin
Avoid
A preservative that works by slowly releasing formaldehyde, a known sensitizer and carcinogen. Products containing releasers must carry a warning in the EU when formaldehyde levels are high.
What it does
Preservative. Stops bacteria, yeast and mould growing in the product.
Worth knowing
A preservative that slowly releases formaldehyde, a known sensitizer and carcinogen.
Can cause contact allergy that, once developed, returns on every exposure.