The leaves and root of Daucus carota was purchased from a commercial grocer (Costco, Mountain View, CA). The root of burdock (Acrtium ssp.) was obtained from the same location. Frozen tissues were lyophilized to dryness and homogenized in a stainless steel blender (Durabrand) and stored at 4 °C as a dry powder until extraction. Safflower oil and tarragon essential oil were obtained from Amazon.com (part numbers dp/B017JFH5MY and dp/B0084Y1LFM) and used as provided.