A study from the National Institute of Environmental Health Sciences says there may be a link between abnormal breast growth and lavender and tea tree oils.
Reported cases of gynaecomastia, the enlargement of men's breasts, has been growing with ties to topical exposure to the oils.
The study found that key chemicals in the oils boost estrogen and inhibit testosterone.
The oils are often found in soaps, lotions, shampoos and skincare and study lead researcher J. Tyler Ramsey says caution should be taken when using the oils.
"Our society deems essential oils as safe. However, they possess a diverse amount of chemicals and should be used with caution because some of these chemicals are potential endocrine disruptors."
Don't freak out, the Aromatherapy Trade Council has released a few oil safety guidelines so you can enjoy them, semi-worry free.
- Precautions should be observed when using essential oils since they are highly concentrated
- Do not apply undiluted essential oils directly to the skin
- Never use undiluted oils on children under the age of three
- If you are pregnant you should seek the advice of your doctor, midwife before using essential oils
- When used appropriately, essential oils and aromatherapy products are safe for all the entire family