Studies: Essential Oils for Menstrual Pain

These oils starred in three studies (in various combinations, diluted - see the links below) on aromatherapy massage for people with painful periods (dysmenorrhea). What works well for you? 

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Read more here: http://www.ncbi.nlm.nih.gov/pubmed/22435409
And here: http://www.ncbi.nlm.nih.gov/pubmed/23662151
And here: http://www.ncbi.nlm.nih.gov/pubmed/21949670