HIGHEST QUALITY GUARANTEED, peppermint oil MOST POWERFUL: - What distinguishes MAYJAM essential oils are incomparable purity and concentration. Natural, without adulterants or dilutions, their oils provide maximum benefit and are inflexible NOT FALLING VICTIM FOR OIL MINT DILUTED CHEAPER: -. Most competition dilutes its oil with a carrier oil cheap or even with other products potentially hazardous chemicals. Our peppermint oil routinely tested for purity and other unique qualities to ensure you are purchasing the purest available oil.