Preservatives are a common source of skin irritation or allergic reaction in cosmetics and hair products. This is a short list of common offenders to suspect if a product causes problems for you:
Benzyl alcohol
Imidazolidinyl urea
Diazolidinyl urea
Sodium Hydroxylmethylglycinate
Methyl, Propyl, Butyl, and Ethyl Parabens
Phenoxyethanol
DMDM hydantoin
Quaternium-15
Methylisothiazolinone©Science-y Hair Blog 2013
Those in italics are formaldehyde releasers. Formaldehyde is an excellent preservative, but can be commonly irritating to skin and is dangerous to breathe (carcinogenic).©Science-y Hair Blog 2013
Benzyl alcohol is a popular one, I think that may explain why I am not able to use some popular conditioners as leave-ins e.g. Tressemme Naturals.
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