Four commercial essential oils used in this study were purchased from the Fares company (Orăştie, Romania): thyme (Thymus Vulgaris L.), clove (Eugenia caryophyllus—from dried floral buds of Syzygium aromaticum), rosemary (Rosmarinus officinalis L.), and tea tree (Melaleuca alternifolia aetheroleum) obtained using a distillation apparatus (according to European Pharmacopoeia 7th edition, method 8.2.12).