Hi Céline!
This is a great post, thanks for sharing your knowledge with us
I wish I could add to it... Ive never realy used essential oils but its somthing I think if I knew about I might do.. Are there particular brands ect that are best or ones that are more natural than others... Like you said your friends brings ones from india are they the ones to look out for? Or maybe ones to avoid due to enviroment or explotational impact.