Effects of pre- and post-treatment with compositions III, IV, VIII, and IX on different antioxidant enzyme activities in HaCaT cell line receiving acute UVB irradiation. GPX (a); SOD (b); CAT (c) and MDA (d) activities are expressed as % of untreated keratinocytes. Control compositions without SM were: pre/post controls SP 50, SP 70. Data are expressed as mean ± S.D. n = 10. In the case of GPX, SOD, CAT, MDA evaluations Repeated-Measures ANOVA and Pearson correlation tests were performed. Significant differences were marked with * and + in the figures, showing the significance levels in the case of compositions containing SM in suspended or dissolved forms.