I remember michael posted a study done on people with alopecia areata and it had a pic of a guy with all his hair back. The study didn't mention anything about proportions of oils used, i've come across this website and it seems it's referring to the same study.
http://www.worldofhair.com/hair/alopecia-areata.htm
"Researchers found 82 people with alopecia areata diagnosis by their doctor or dermatologist. During the 7 month study those involved quit using topical or oral alopecia pills. Instead, exactly half used a blend of cedarwood (2 drops, 94 mg), lavender (3 drops, 108 mg), rosemary (3 drops, 114 mg) and thyme (2 drops, 88 mg) in a carrier oil mix of jojoba (3 mL) and grapeseed (20 mL). The placebo group were allowed to only use the jojoba & grapeseed carrier oils. Subjects were massaged the oil into the no hair areas of their scalp for 120 seconds every evening and then to wrap a warm compress or towel around their head to enhance absorption. "
"The average area of hair regrowth with the essential oils was 104 square cm..."
http://www.worldofhair.com/hair/alopecia-areata.htm
"Researchers found 82 people with alopecia areata diagnosis by their doctor or dermatologist. During the 7 month study those involved quit using topical or oral alopecia pills. Instead, exactly half used a blend of cedarwood (2 drops, 94 mg), lavender (3 drops, 108 mg), rosemary (3 drops, 114 mg) and thyme (2 drops, 88 mg) in a carrier oil mix of jojoba (3 mL) and grapeseed (20 mL). The placebo group were allowed to only use the jojoba & grapeseed carrier oils. Subjects were massaged the oil into the no hair areas of their scalp for 120 seconds every evening and then to wrap a warm compress or towel around their head to enhance absorption. "
"The average area of hair regrowth with the essential oils was 104 square cm..."