Analytical control of preservative labelling on skin creams.

Contents of 23 preservatives (22 permitted and 1 non-permitted) were analysed in 67 skin creams to verify whether these products complied with the Cosmetic Directive with respect to ingredient labelling, as well as with respect to maximum allowed concentrations of the respective preservatives. The preservatives selected for the analysis were: parabens, 2-phenoxyethanol, benzoic acid, 4-hydroxybenzoic acid, sorbic acid, salicylic acid, formaldehyde and formaldehyde releasers, 3:1 mixture of 5-chloro-2-methyl-4-isothiazolin-2-one and 2-methyl-4-isothiazolin-2-one (Kathon CG), 2-bromo-2-nitropropane-1,3-diol (Bronopol), 5-bromo-2-nitro-1,3-dioxane (Bronidox) and methyldibromo glutaronitrile. 1 or more parabens were present in 87% (n=58) of the investigated products, 2-phenoxy ethanol in 49% (n=33) of the products, and formaldehyde/formaldehyde releasers were present in 51% (n=34) of the products. Kathon CG was found in 3 products, acid preservatives (except salicylic acid) in 8 products, Bronopol in 5 products, and methyldibromo glutaronitrile was present in 4 products. The contents of all of the target preservatives in the skin creams were within the maximum allowed concentrations of the respective substances. Incorrect ingredient labelling with respect to paraben content was found in 10% (n=7) of the investigated products, 33% (n= 22) of the products were not declared for the content of formaldehyde/formaldehyde releaser, and 7% (n=5) products were incorrectly labelled for the content of 2-phenoxyethanol. In 1 of the products containing Kathon CG, the ratio of 5-chloro-2-methyl-4-isothiazolin-2-one to 2-methyl-4-isothiazolin-2-one (1.4:1) was not correct. 4 of the 8 products containing acid preservatives were not labelled for the content of these substances. All in all, in 45% (n=30) of the investigated skin creams ingredient labelling was incorrect with respect to preservative contents. The proportion of incorrect labelling is reduced to 23% (n = 15), when the formaldehyde content in skin creams below 30 ppm is not accounted.