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Quaternium-15This chemical is a quaternary ammonium salt used as a surfactant and preservative in many cosmetics and industrial substances. It acts as an antimicrobial agent by releasing formaldehyde. This can cause allergic reactions and potential immune system toxicity.

It can be found under a variety of names including,  Dowicil 200, Dowicil 75 and Dowicil 100.

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