I've had no discernible improvement using T-tree oil. That is I've applied a "100 % pure oil" extract on a consistent basis for several months and saw no better changes in my hair or persistent scalp problems. Maybe 4-6 months of T-tree regular application was too short, or maybe it lessened my daily degree of copious hair fall? Exceptions do occur, but I'm not the sort who likes to promote false hope. However, I do like the scent.
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You are right KenE , overuse will definitely dry you out. Of course I used only the tincture extract (alcohol).