Some cosmetics chemicals are designed to react with water in the bottle to generate a little formaldehyde, a preservative, to keep the product from growing mould and bacteria.
But formaldehyde is a potent allergen which the World Health Organization consider carcinogenic.
Formaldehyde releasers include DMDM hydantoin, imidazolidinyl urea, diazolidinyl urea, and quaternium-15.
A 2010 study found that nearly one fifth of cosmetic products contained a formaldehyde releaser. Johnson & Johnson, a personal care products giant, is phasing out formaldehyde releasers under pressure from health advocates
Where do you find them?
Shampoos, conditioners, bubble bath and other personal care products.
Even those intended for children.
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