How is the chemical DMDM hydantoin reacting to cause problems
Formaldehyde. Shampoos containing preservatives that release formaldehyde such as quaternium-15, diazolidinyl urea, DMDM hydantoin, bronopol, or imidazolidinyl urea can be severely damaging because they can release formaldehyde into the air you breath and into your skin, warns Cates.
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