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Does scalp cleanliness impact hair growth?

I recently read that the only two things that influence how fast your hair grows are having a clean scalp and your diet. I feel like as long as you're not malnourished then diet shouldn't have too much to do with it, but is it true that the buildup of sweat or grease on your scalp between washes could inhibit hair growth? Thanks


  • I have never seen any data showing that sweat or scalp oil will inhibit hair growth. It is true that if you're very malnourished your hair will suffer.
  • Thanks Randy :)
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