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Clinical anti-skin aging efficacy of base and PE gels: (a) skin color, (b) skin pigment, (c) skin elasticity, (d) skin wrinkle reduction, (e) skin hydration, and (f) subjective assessment at the completion of study period. ∗ indicates the significant difference from the baseline (∗p < 0.05, ∗∗p < 0.001).
