Diazolidinyl urea (Keeping your lotion mold-free)

Diazolidinyl urea is a broad-spectrum biocide that is ubiquitous in cosmetics:

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It does an admirable job. You'll see it EVERYWHERE once you start reading labels. It tends to be pretty benign, but a contact allergy can result, which makes it hard to find a usable suite of hygeine products for those afflicted.

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