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TEA TREE OIL SAFETY
According to the American Cancer Society: "Tea tree oil is toxic when swallowed. It has been reported to cause drowsiness, confusion, hallucinations, coma, unsteadiness, weakness, vomiting, diarrhea, stomach upset, blood cell abnormalities, and severe rashes. It should be kept away from pets and children."
Although tea tree oil has been shown to treat many ailments, ie.. acne tea tree oil treatments and fungus toenail tea tree oil treatments, please read everything below, and be sure to wash your hands completely when dealing with tea tree oil.
A small number of people experience allergic contact dermatitis as a reaction to dermal contact with tea tree oil. In an Italian study of 725 consecutive patients, patients were patch tested with undiluted, 1%, and 0.1% tea tree oil. For undiluted tea tree oil, nearly 6% of the patients observed positive reactions of skin irritation. Only 1 of 725 patients observed a positive reaction of skin irritation with the 1% dilution. None of the 725 patients observed adverse reactions with the 0.1% dilution. Allergic reactions may be due to the various oxidation products that are formed by exposure of the oil to light and/or air.
External application of tea tree oil undiluted and/or at inappropriate high doses has been associated with toxicity, including death, in cats and other animals, due to ingestion during grooming.
A highly disputed case study reported in The New England Journal of Medicine concluded that repeated topical exposure of lavender and tea tree oils may have caused prepubertal gynecomastia in three young boys. The study involved just three individuals and found lavender to be the only common ingredient used by the boys in the study. While all three cases involved the use of products containing lavender oil as an ingredient, only one boy also used products containing tea tree oil. In all cases, the prepubertal gynecomastia reversed after several months. Researchers have noted that estrogenic or antiandrogenic activities have also been reported for some other commonly used essential oils, as well as some foods such as almonds and peanuts.
Others have cast doubt on the conclusions of the article and dismissed the study as having used "poor methodology". The research has been most criticized for making medically related conclusions about tea tree oil based on a single individual, while outside factors were more likely to have caused the condition. Critics of the study note that millions of people use products containing tea tree oil on a regular basis and there has never been another documented relation of tea tree oil and gynecomastia before or after this study was published.
If used in concentrations below 4% or particularly below 1%, tea tree oil may fail to kill bacteria and create selection pressure, which may result in them becoming less sensitive to tea tree oil and even some antibiotics in vitro.
Undiluted tea tree oil can cause some hearing loss when used in the ears of animals; however, a 2% concentration has not been shown to have any lasting effect. It is not known whether the same is true for humans.
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