I went looking for the tea tree oil because I heard of it before. But I came across this little bit of info. Not sure how accurate it is.
One study shows that tea tree oil may alter hormone levels. There have been three case reports of topical tea tree oil products causing unexplained breast enlargement in boys. People with hormone-sensitive cancers or pregnant or nursing women should avoid tea tree oil. For more information, read Lavender and Tea Tree Oils Linked to Breast Enlargement in Boys.
Occasionally, people may have allergic reactions to tea tree oil, ranging from mild contact dermatitis to severe blisters and rashes.
Undiluted tea tree oil may cause skin irritation, redness, blistering, and itching.
This information is from
Tea Tree Oil - What is Tea Tree Oil
Tea tree oil should not be taken internally, even in small quantities. It can cause impaired immune function, diarrhea, and potentially fatal central nervous system depression (excessive drowsiness, sleepiness, confusion, coma).
The tea tree oil in commercial toothpastes and mouthwashes is generally considered to be acceptable because it is not swallowed. Avoid homemade tea tree oil mouthwashes.
Seek medical attention if you experience symptoms of overdose: excessive drowsiness, sleepiness, poor coordination, diarrhea, vomiting.
Don't use tea tree oil if you are pregnant or breastfeeding.
Keep tea tree oil out of the reach of children and pets.