Essential Oil Applications | Inhalation, Diffusion and Topical Applications


An answer to a frequently asked question:

When to use inhalation, and when to apply essential oils topically?

For more detailed information, why not sign up for the free Tisserand Institute mini-course, How Essential Oils Work in the Body?


  1. This is excellent and simple. Thanks so much.

  2. Greetings,

    Would you be willing to tell me how many drops you consider is safe to add to a 150mL ultrasonic diffuser please? I understand drops are not equal based on the oil being used and the bottle orifice so my question is general based. I feel 8-12 drops is safe to add into 150mL of water for a medium to large open area running intermittently up to one hour, however I am aware of someone adding 20+ drops and then re-adding more essential oil after a few cycles using the diffuser. I have been searching for resources specific to diffusion but have not been successful finding detailed information.

    I hope you are well and taking care.


    • Hi Tammy, There is not a specific answer to this question as there is many different factors that come into play, including the oils you are using, output of the diffuser, size of the room, airflow in the room and more. Your diffuser may come with instructions that say how much oil to put in based on the known output of that diffuser, but even that is just a general recommendation. A good rule of thumb is typically 3-5 drops of oil per 100ml of water, but this is just a guideline and you could have to increase or decrease depending on different factors. Remember, you can always add, but cannot take away, so its good to start conservative. Some oils are also stronger then others.

      All in all, diffusion is pretty safe method of use. Intermittent diffusion is best. I will include a graphic that may help:

      Definitely listen to your body and be mindful of others as well. If you experience any symptoms of over exposure, like dizziness, nausea, lightheadedness, chest pain or other signs or discomfort, definitely turn off your diffuser and get to fresh air.

      I hope this has been helpful! You may also enjoy joining us for our Essential Oil Safety program when we run it again in 2021:

      All the best, Shane


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