Comparison of Lavandula angustifolia Mill. (info.achs.edu)
This has since been tested in healthy human volunteers who were given E. angustifolia extract for one week. (mindbodygreen.com)
However, it's important to note that these studies were assessing the soothing properties of lavender L. angustifolia and NOT lavandin Lavandula intermedia (Emeric ex Loisel.) (info.achs.edu)