Tea tree oil (TTO) is toxic if swallowed, with even small amounts causing confusion, loss of coordination, and coma in children (e.g., 2-10 mL), and larger ingestions potentially fatal. It's also highly toxic to pets (cats and dogs), where as little as 7 drops of pure oil can poison them, causing tremors, paralysis, coma, and death, though diluted pet products (1-2% concentration) used as directed are generally safe. Toxicity can also occur from skin absorption, especially with high concentrations or broken skin, leading to systemic effects.
When put on the skin, tea tree oil is generally safe and might be helpful in treating acne and other infections on the skin's surface. Avoid swallowing tea tree oil. Drinking even small amounts can be toxic and lead to breathing and movement problems.
Adding anything – including essential oils – to the air you breathe is not recommended. Fresh, clean air is best. If someone swallows an essential oil, or a product containing essential oils, call Poison Control at 1-800-222-1222 right away.
Why Could Tea Tree Oil Be Banned? Tea tree oil is facing a potential ban in the European Union due to its recent classification as a reproductive toxin (Category 1B) by the European Chemicals Agency's Risk Assessment Committee (ECHA).
Taking tree tea oil by mouth has caused serious side effects, including confusion, inability to walk, unsteadiness, rash, and coma.
The Bottom Line
It is poisonous if swallowed, so it should not be used in or around the mouth.
What are the symptoms of toxicity?
What Do We Know About Safety? Tea tree oil should not be swallowed. Taking it orally can cause serious symptoms such as confusion, unsteadiness, inability to walk, and coma. Most people can use topical products containing tea tree oil without problems, but some people may develop redness or irritation of the skin.
The neurotoxic essential oils
Sage officinale (Salvia officinalis) : thujone. Rosemary camphor (Rosmarinus officinalis): camphor. Mint pouliot (Mentha pulegium) : pulegone. Blue Tansy.
Still, once a product contains several different essential oils with much more than that percentage, there's a higher risk of an adverse reaction from your skin. This irritation will cause premature aging and long-term damage, even if you don't see the irritation in your skin for a while.
You should never ingest tea tree oil, and avoid using it undiluted on skin, near eyes/mouth, on children under 3, or if pregnant/breastfeeding; also, don't use it if you have eczema or sensitive skin as it can cause irritation, dryness, redness, or allergic reactions like dermatitis, especially if oxidized (old or exposed to air/light).
Mugwort, Thyme, Rue and Pennyroyal are toxic and hazardous. A lot of people are susceptible to allergic reactions from certain essential oils which cause no problems to others. As an example, I had a lady who got a severe allergic reaction just with inhalation of the geranium oil.
Safe Application Methods for Tea Tree Oil
Add 2–3 drops of tea tree oil to a bowl of hot water (not boiling, to prevent burns). Position your head about 10–12 inches over the water and drape a towel over your head to trap the steam. Breathe in the vapor gently for 5 to 10 minutes.
To do this you will need to dilute the tea tree oil with a carrier oil to avoid it creating a negative reaction. Essential oils and water do not mix well together by themselves, as the oil will just sit on top of the water and absorb directly into the skin, which can cause sensitivity issues.
If a hydrocarbon misses the airway and reaches the stomach, there is very little risk of harm. The stomach does not absorb hydrocarbons. In the worst case, swallowing hydrocarbons causes nausea, mild stomach discomfort and belching. The hydrocarbon will pass harmlessly through the bowels.
What Happens if You Don't Dilute Tea Tree Oil on Your Skin? Essential oils on their own are very powerful, so it's important to dilute them. Applying undiluted tea tree oil could cause harmful skin reactions and side effects such as rashes, blisters, or dryness that could make eczema symptoms worse.
The 30/50/20 rule for essential oils is a blending guideline for creating balanced, harmonious scents, suggesting you use 30% top notes, 50% middle notes, and 20% base notes for longevity and depth. Top notes are light and fast-evaporating (like citrus), middle notes are the heart of the blend (like florals/herbs), and base notes are grounding and long-lasting (like woods/resins). For a 10-drop blend, this means 3 drops top, 5 drops middle, and 2 drops base.
Leafy Greens
Spinach, kale, and other dark leafy greens are high in vitamin K and antioxidants, which protect brain cells from damage. Adding greens to your daily meals can help improve thinking and memory.
Essential Oils, Autonomics, and Vagus Nerve Stimulation
External vagus nerve stimulation points (behind the ear along the mastoid) and stimulatory oils (e.g., clove paired with lime) applied on the neck—not near the eye—are presented as a low-barrier way to encourage parasympathetic tone.
Tea tree oil should never be consumed and is considered to be extremely hazardous — it becomes toxic when swallowed. According to the American Cancer Society, if you ingest the oil you may become confused or drowsy. They've reported cases of hallucinations, comas, severe rashes, weakness and vomiting.
Topically applied tea tree oil has been used successfully as a topical treatment for Trichomonas, Candida albicans, and other vaginal infections. More. Topically applied oil has been studied and used successfully as a topical treatment for Trichomonas, Candida albicans, and other vaginal infections.
The terpenes found in tea tree oil are lipophilic, which means that they can be rapidly absorbed over the skin. For example, it has been established that terpinen-4-ol can very easily permeate the human epidermis.
Examples of high toxicity essential oils include oil of wintergreen (methyl salicylate), clove oil, and camphor.
Our skin is permeable, meaning it absorbs substances applied to its surface. This includes essential oils, which are made up of plant compounds that can be absorbed through the skin into the bloodstream. Once in the bloodstream, essential oils can travel to different parts of the body and deliver therapeutic benefits.
Toxicologist Ron Kirschner, MD, also warns of their danger. "Ingesting essential oils like camphor, eucalyptus oil, tea tree oil or pine oil has been associated with changes in mental states and seizures. Ingesting lavender oil can cause severe allergic reactions and pennyroyal oil can give you toxic liver damage."