SLC6A4 and major depressive disorder: Reviews regarding the mechanisms of lavender in aromatherapy, previous studies have revealed that this plant due to the high content of terpenoid compounds such as linalool and linalyl acetate displayed their promising effects in aromatherapy for improving anxiety, and depression through some mechanisms, for example, interact with the N-methyl-D-aspartate (NMDA) receptors and dysfunction of voltage-gated calcium channels, inhibit serotonin transporter (SERT), and increased parasympathetic tone [71].