Hi
There has been a study by Aberdeen Infirmary Dermatology department using aromatheraphy on AA.
They used Grapeseed oil or Jojoba oil as a carrier, and then Thyme, Cedarwood, Lavender and Rosemary. I dont know the doseage and Im still trying to find it out.
They massaged the oils in the scalp daily for two minutes.
Its shown results with women but not so much with men.