Lavender is one of the best known essential oils. It was added to bath water in Roman times and is associated with both cleanliness and deeper forms of hygiene, such as wound care, including serious abscesses. It is antispasmodic and soothing and is believed to lower high blood pressure and relieve headaches. It is non-toxic and non-irritating and blends well with lemon and peppermint when taken to reduce spasms and relax nerves.
Lavender essential oil can be added to shampoo and/or conditioner — approximately one drop per ounce — as well as to ice cream, cheesecake, and rice pudding and many other culinary dishes. It imparts nuance and interest and lengthens the shelf life of the foods, but a little is better than too much.