Triclosan in Cosmetics, Personal Care Products Increases Allergy Risk
Triclosan - an antibacterial chemical found in toothpaste and other products - can contribute to an increased risk of allergy development in children. This comes from the Norwegian Environment and Childhood Asthma Study, in which the Norwegian Institute of Public Health is involved. Similar results are reported in the USA
Triclosan has been in use for decades, but was
recently associated with allergies in children in an
American study, the National Health and Nutrition
Examination Survey (NHANES).
The new Norwegian study found similar
associations between allergies and triclosan
levels measured in children's urine.
The study found that triclosan levels measured in urine were associated with elevated levels of Immunoglobulin E (IgE) and rhinitis (blocked nose/hay fever) in 10 year-olds.
623 urine samples were collected and measured at the Center for Disease Control and Prevention in Atlanta, USA. Approximately 50 per cent of the Norwegian children had detectable levels of triclosan, while 80 per cent of American children had measurable levels. The children had approximately the same amount of triclosan exposure.
Triclosan can change the bacterial flora on
the skin, in the mouth and in the intestines.
A change in the bacterial composition of
"good" bacteria can cause an increased risk of
developing allergies (hygiene hypothesis).
Therefore, increased use of triclosan and
antibacterial products has generally been
associated with an increased
incidence of allergies.
For many years, the health authorities in Norway have called for a reduction in the use of antibacterial products to prevent the development of resistant bacteria.
In a study of triclosan use in Norway in 2001, it was found that 85 per cent of the total amount of triclosan came from cosmetic products, of which 75 per cent were toothpaste. Since this study, triclosan has been removed from a variety of products.
The extent to which Norwegian children are exposed
to triclosan today is uncertain. In the USA, where
there is annual sampling and monitoring of chemical
exposure, there is little evidence that exposure
to triclosan is being reduced.
FDA: Triclosan: What Consumers Should Know
About the study
The triclosan study is a collaboration between the Norwegian Institute of Public Health, Oslo University Hospital and the National Institute of Health Sciences (NIEHS) in the USA, where Randi Bertelsen is currently a guest researcher. The project is partly funded by the Research Council of Norway's programme for Environmental Exposures and Health Outcomes.
Bertelsen RJ, Longnecker MP, Løvik M, Calafat AM, Carlsen K-H, London SJ, Lødrup Carlsen KC. Triclosan exposure and allergic sensitization in Norwegian children. Allergy 2012; DOI: 10.1111/all.12058.
Original article: http://www.fhi.no/eway/default.aspx?pid=238&trg=MainLeft_