Four essential oils including Peppermint & Roman Chamomile make a lovely aroma, safe to use as and when required.
Do not use if you are pregnant - see the pregnancy safe blends for you. Negates homeopathic remedies - fine to use if you have low or high blood pressure, suffer epilepsy or kidney conditions.
Aromatherapy blends have a cumulative effect, the longer you use them, the better they get!