The Alliance of International Aromatherapists (AIA) has issued a statement on the Internal Use of Essential Oils:

Internal Use Statement with regard to AIA practitioners

Effective February 26, 2010:

AIA does not endorse internal therapeutic use (oral, vaginal or rectal) of essential oils unless recommended by a health care practitioner trained at an appropriate clinical level. An appropriate level of training must include chemistry, anatomy, diagnostics, physiology, formulation guidelines and safety issues regarding each specific internal route (oral, vaginal or rectal).

For more information, please visit the AIA site.