Using deodorants might increase a woman's chance of developing breast cancer, British scientists have revealed.
Aluminium, which is used as an antiperspirant in most deodorants, was found in breast tissue taken from breast cancer patients who had undergone mastectomies.
Researchers found "significantly higher" levels of aluminium in the underarm region of the breast where antiperspirants are sprayed than in other parts of the breast.
The report, published in the Journal of Inorganic Biochemistry and based on the study of 17 patients, suggests a link is likely while acknowledging its findings do not constitute "direct evidence".
Dr Sarah Cant, senior information officer at Breakthrough Breast Cancer, urged consumers to approach the findings with caution.
"There is no reliable scientific evidence to suggest a link between deodorant or antiperspirant use and breast cancer.
"A large number of scientific studies have investigated breast cancer risk factors. However, there is no good evidence to suggest that either deodorant or antiperspirant use or exposure to aluminium can increase the risk of developing this disease. This very small study does not provide any further proof."
Breast cancer is the primary cause of death among women aged 35 to 54.