Lavender is likely safe for most adults in food amounts. It is possibly safe when taken by mouth, applied to the skin or inhaled in medicinal amounts.
When taken by mouth, lavender can cause constipation, headache and increased appetite. When applied to the skin, lavender can sometimes cause irritation.
Special Precautions & Warnings:
Children: Applying products to the skin that contain lavender oil is possibly unsafe for young boys who have not yet reached puberty. Lavender oil seems to have hormone effects that could disrupt the normal hormones in a boy’s body. In some cases, this has resulted in boys developing abnormal breast growth called gynecomastia. The safety of these products when used by young girls is not known.
Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking lavender if you are pregnant or breast-feeding. Stay on the safe side and avoid use.
Surgery: Lavender might slow down the central nervous system. If used in combination with anesthesia and other medications given during and after surgery, it might slow down the central nervous system too much. Stop using lavender at least 2 weeks prior to a scheduled surgery.