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All commercially manufactured hair products contain preservatives to keep them fresh and to inhibit the growth of bacteria and fungi. May of these chemicals can also cause dry, itchy scalp and skin. Here are some commonly used preservatives that are known to cause skin irritation:

  • Benzyl alcohol
  • Imidazolidinyl urea
  • Diazolidinyl urea
  • Sodium Hydroxylmethylglycinate
  • Methyl, Propyl, Butyl and Ethyl parabens
  • Phenoxyethanol
  • DMDM hydantoin
  • Quaternium-15
  • Methylisothiazolinone
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Thanks for the article. I have some of those ingredients in some hair products and have some itching. I didn't know what the ingredients were for or that they could cause itching.

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