Unfortunately, yes. They can be when used inappropriately. Just because something is "natural" and "pure," doesn't mean its not a potent substance. When used undiluted and long-term, essential oils have been known to cause adverse effects on adults, children, and animals.
We've heard stories recently where a baby was treated with undiluted peppermint and had a seizure, a woman had an undiluted treatment and still has ringing in her ear, another woman ingested lemon oil daily in her water and her tongue went numb, and more...
Possible adverse effects from overuse of undiluted essential oils include:
Redness, rashes, blistering
Itching, general irritation
Interference with medication
Alters blood pressure
If you or someone you know has experienced an adverse reaction from essential oil use, please take a moment and fill out an Injury Report Form.
Read our first report here.