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Bridget M. Kuehn

JAMA. 2007;297:1307.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

Lavender and tea tree oils found in toiletries may have endocrine-disrupting effects on boys, according to a report by researchers from the National Institute of Environmental Health and Sciences (NIEHS).

The report includes case studies of three boys aged 4, 7, and 10 years who developed enlarged breast tissue after regular use of soap, skin lotion, shampoos or styling products containing lavender or tea tree oils (Henley D et al. N Engl J Med. 2007;356:479-485). The boys, who were otherwise healthy, had normal hormonal levels when they were diagnosed. The symptoms subsided in all three boys after they avoided products containing lavender or tea tree oils for several months.

Further laboratory experiments by NIEHS scientists using human cells found that the oils mimic the effects of estrogen, a hormone that stimulates breast development in women, or inhibit the effects of androgens, hormones that inhibit breast growth . . . [Full Text of this Article]