Good antibacterial agent that has been used for over 40 years in many products, including those for oral hygiene, cleansers, and deodorants (Sources: Federation of European Microbiological Societies Microbiology Letter
, August 2001, pages 1–7; and American Journal of Infection Control
, April 2000, pages 184–196).
As an antibacterial agent, triclosan can help begin the process of killing the bacteria that plays a role in acne, which is why it is included in some rinse-off products designed for those with breakout-prone skin (Source: The Journal of Dermatological Treatment, May 2010, pages 201-205).
Despite this benefit, triclosan is not without its controversies. However, despite what you may have read online, it is not a health threat nor is it an ingredient that is a must to avoid. The latest research has proven that triclosan is safe as used in cosmetic products, assuming that said products are being used as directed. In fact, one study concluded that "The amount [of triclosan] absorbed suggests that daily application of a standard adult dose would result in a systemic exposure 890 times lower than the relevant no-observed-adverse-effect level." In short, there is no reason to avoid triclosan in skin-care products, especially if acne is your concern (Sources: Critical Reviews in Toxicology, November 2010, pages 1-30 and May 2010, pages 422-484; and Antimicrobial Agents and Chemotherapy, January 2010, pages 570-572).
A study concluding that triclosan causes cell death was done on gingival cells that line the mouth. Not only are these cells different from skin cells and intact skin, but the results primarily indicated triclosan was a problem when mixed with oral-care ingredients zinc citrate and sodium fluoride. In other words, the detrimental effect observed in vitro (not in an actual human mouth) was not attributable to triclosan alone, not to mention the damage was minimal (Source: European Journal of Oral Science, April 1998, pages 628–636).
Scientists who belong to the European Union’s Scientific Committee on Consumer Safety analyzed multiple studies and data on triclosan exposure. In March 2011, they concluded triclosan was safe as used in cosmetic products at levels below 0.3% and when the product is used as directed (for example, use the facial cleanser to wash your face, but don’t drink the stuff). Currently, the United States Food & Drug Administration (FDA) maintains that “triclosan is not known to be hazardous to humans” and that they “do not have sufficient safety evidence to recommend changing consumer use of products that contain triclosan at this time.” (Sources: http://ec.europa.eu/health/scientific_committees/consumer_safety/docs/sccs_o_054.pdf; and http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm205999.htm).
The FDA is expected to provide results of their ongoing review of triclosan in winter 2012.