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The skin surface hydration in 21 volunteers before and after treatment with different concentrations of 734THIF of 5-7HP formulation at different times. (A) non-content of 734THIF, (B) 0.3% 734THIF and (C) 1% 734THIF (n = 7 in each group; * p < 0.05 compared with the group of zero weeks).
