Science Based Research:

http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0032645

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The Science of Smell:

https://www.ted.com/talks/luca_turin_on_the_science_of_scent

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Essential Oils & Safety / National Association of Holistic Aromatherapy (NAHA):
https://naha.org/explore-aromatherapy/safety

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