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Purpose: This study aims to determine the optimal mixing ratio of mulberry and peppermint leaves and evaluates their biological activities to identify whether the estimated ratio is suitable for use in inner beauty and cosmetic ingredients.Methods: Total polyphenol and flavonoid contents, 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2′-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging activities, and tyrosinase and elastase inhibition activities were measured to optimize the mixing ratio of mulberry and peppermint leaves.Results: The mixture of mulberry and peppermint leaves showed a total polyphenol content of up to 46.58 mg TAE/g, a total flavonoid content of up to 45.54 mg QE/g, and DPPH and ABTS radical scavenging activities of up to 74.18% and 40.60%, respectively. Tyrosinase and elastase inhibition activities were up to 67.46% and 35.01%, respectively. In the interest section, the maximum antioxidant and tyrosinase inhibitory activities were obtained at a mulberry:pepperint mixing ratio of 1.49:0.75 (g:g). In the experimental section, the maximum antioxidant and tyrosinase inhibitory activities were obtained at a mulberry:pepperint mixing ratio of 1.79:0.80 (g:g). Further, the maximum antioxidant and elastase inhibitory activities were obtained at a mulberry:pepperint mixing ratio of 1.11:0.75 (g:g).Conclusion: This study determined the superiority of the antioxidant activity, tyrosinase and elastase activity inhibition efficacies, and optimal mixing ratios of mulberry and peppermint leaves. Based on our findings, we believe that mulberry and peppermint leaves at an optimal mixing ratio will have considerable use as inner beauty and cosmetic ingredients.

Mulberry and Peppermint Leaves Mixing Ratio Optimization for Skin Beauty