Triclosan, similar in its uses and mechanism of action to triclocarban, is an antibacterial and antifungal agent found in consumer products, including soaps, detergents, toys, and surgical cleaning treatments

The Many Health Hazards of Triclosan

As noted in the featured article in The Atlantic,8 the reasons for avoiding triclosan are far from few... This antibacterial ingredient has been linked to:

Allergies
Thyroid dysfunction
Endocrine disruption
Weight gain
Inflammatory responses
Most recently, triclosan was found to aggravate the growth of liver and kidney tumors, which came as a surprise to the researchers. According to one of the authors:9

"We aren't saying that triclosan causes cancer. We're just saying that with constant exposure, this environmental agent, which is extremely ubiquitous, can promote development of tumors. If one can avoid it, I would avoid it."

In another interview he clarified by saying:10

"If you have a damaged cell that's been attacked by a mutagen, triclosan promotes the development of the tumor. The compound also causes inflammation, which means that all the ingredients necessary for developing cancer are present."