What is the science behind essential oils?

The claims about essential oils are many and include curing the flu, preventing headaches, soothing anxiety and many other claims. This has led to more people than ever putting oils on their skin, diffusing them into the air and even taking them in capsules. Is there potential harm from doing this or are the many claims legit and is there science to back them up? In this podcast we talk about some of the limitations with all essential oils, scientific studies that have shown negative effects about certain oils and scientific studies that have shown positive effects about certain oils. 
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SOURCES //
https://www.forbes.com/sites/brucelee/2018/03/18/will-essential-oils-like-lavender-and-tea-tree-make-your-breasts-larger/#42c8270e3fc2
https://www.dietvsdisease.org/do-essential-oils-work/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2994788/
https://www.ncbi.nlm.nih.gov/pubmed/8805113 https://www.ncbi.nlm.nih.gov/pubmed/2145499?dopt=Abstract
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3612440/
https://www.ncbi.nlm.nih.gov/pubmed/25389481