From what I have seen, it can help to restore hair growth back to a normal amount for your head (so, for instance, those who are recovering from say, traction alopecia, have had good luck with it). As for increasing hair growth for someone with normal growth as is, I have yet to hear anything conclusive.
Though, should you decide to try out castor oil in your regimen, I would suggest quite a dilute solution of it, as castor oil is very, very thick.
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