Study of the Composition of 140 Shampoos: Similarities and Differences Depending on the Sales Channel Used

    March 2019 in “ European Journal of Dermatology ”
    Céline Couteau, Harona Diarra, Zaiane Schmitt, Laurence Coiffard
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    TLDR Pharmacy-sold shampoos tend to have fewer allergens compared to those sold in other stores.
    The study examined 140 shampoos to determine if their compositions varied based on where they were sold: pharmacies, mass-market stores, or mail-order retailers. It categorized the shampoos into four types: gentle, infant-formulated, anti-dandruff, and non-specific claim. The findings revealed that shampoos from pharmacies generally contained fewer allergens, with baby shampoos being allergen-free. Anti-dandruff shampoos from pharmacies also had a wider range of active ingredients. While the cleansing bases were similar across sales channels, there was a notable difference in the number of preservatives and allergens, with pharmacy-sold shampoos having fewer allergens. The study concluded that the term "gentle" does not necessarily mean free of allergens or irritants, and that pharmacy-sold shampoos are less likely to contain allergens listed under Regulation (EC) No. 1223/2009.
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