Contraindications
Lavender oil has recently been implicated in gynecomastia, the abnormal development of breasts in young boys. Denver endocrinologist Clifford Bloch hypothesized the link after three boys presented with enlarged breasts. Subsequently, Derek Henley and Kenneth Korach of the National Institute of Environmental Health Sciences in Research Triangle Park, N.C., discovered in lavender and tea tree oil the presence of compounds which both suppress male hormones and mimic female hormones.
Because sex hormone levels normally are low prior to puberty, young boys and girls particularly are sensitive to estrogenic and androgenic compounds. The discovery of the gynecomastia link in boys has led some researchers to suspect lavender and tea tree oils, which are present in various personal care products including shampoos and lotions, may also contribute to the increased incidence of early breast development in girls.
Discontinuation of use of these products resulted in rapid reversal of gynecomastia in Bloch’s young patients.
However, the conclusion that the gynecomastia actually was caused by the essential oils in the products used by the three boys are currently being disputed by the Natural Artisan Perfumers Guild and Cropwatch on the claimed basis of insufficient evidence.
Read more about this topic: Lavender Oil