TriclosanUpdated a month ago

(Additional Names: 5-Chloro-2-(2,4-dichlorophenoxy)phenol)

An antibacterial agent in toothpaste and antibacterial hand and body washes, as well as a preservative in cosmetics and personal care products. Animal studies have shown that exposure to high doses of triclosan is associated with a decrease in the levels of thyroid hormones. Triclosan may bind to estrogen and/or androgen receptors and thus interfere with the normal function of the endocrine system. There is also evidence that exposure to triclosan contributes to making bacteria resistant to antibiotics. And triclosan imported from India and China may contain dioxins linked to cancer and endocrine-disruption. 

Sources:
https://www.fda.gov/ForConsumers/ConsumerUpdates/ucm205999.htm
https://online.personalcarecouncil.org/ctfa-static/online/lists/cir-pdfs/FR569.pdf
https://www.niehs.nih.gov/health/topics/agents/dioxins/index.cfm