This Soap Ingredient Linked to Liver Tumors In Mice

TIME

Triclosan, a widely used antibacterial, is everywhere: in your cleaning supplies, soap, acne lotion, fabrics and even toothpaste. So too are the signs that it might be toxic: a 2012 study showed that triclosan impairs muscle contraction in cells, and other studies have linked it to endocrine disruption and bacterial resistance. Now, new research published Monday in Proceedings of the National Academy of Sciences finds that long-term use of triclosan may promote the growth of cancerous tumors in lab mice.

Mice exposed to triclosan for six months—which is the equivalent to about 18 human years—had significantly more liver fibrosis, or hardening of the tissues. “If you have a damaged cell that’s been attacked by a mutagen”—like tobacco smoke, for instance—”triclosan promotes the development of the tumor,” says co-leader of the study Robert H. Tukey, PhD, professor in the departments of chemistry and biochemistry and pharmacology at the University of California…

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