You might want to read this: Herb and Essential Oil Summary Chart
Here is an abstract:
EO’s: bergamont, clary sage, roman chamomile, geranium, lavender, orange, lemon, rose, rosemary, thyme, ylang ylang, lemon, patchouli. [...]
Hair loss/Growth Stimulating:
EO’s: basil, cajute, carrot seed, cedarwood, clary sage, cypress, eucalyptus, juniper, lavender, orange, peppermint, rosemary, clary sage, thyme, ylang ylang, lemon, yarrow, lemon balm, parsley."
I'd say a health food store should have it but you could always find it online if you do a search for it. Good luck!