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Beauty Braids & Beyond - Online Beauty Supply Store
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DMDM Hydantoin

(Preservative, Non-ionic)
DMDM Hydantoin is an antimicrobial agent. This ingredient is a  formaldehyde releasing surfactant used to prevent the growth of microbes in water based formulations.
As a formaldehyde releasing preservative can be very toxic and irritating. It has been linked to hair loss and sever scalp reactions.