Each of their wellness oils contains a unique formulation of essential oils which have both trans-dermal (through the skin) and olfactory (through a sense of smell) aromatherapeutic benefits. In order to fully enjoy them they recommend completing their 6-point patent-pending ritual with just one oil. You can certainly use more than one oil during the day, but they recommend spacing it out (for example: use one in the morning and one in the evening). Also, they encourage you to use the oils when you wish to target a specific concern (for example pure energy when you need a boost to get through the day).