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The long term study of the difference in efficacy and effect rate of various concentrations of retinol (1500–6600 IU) in middle age women
Purpose Retinol is widely used for topical application for antiaging. However, the efficacy and effect rate of different concentrations of retinol have been rarely analyzed. Therefore, in this study, the efficacy and rate of effect of retinol concentrations from 1500 IU to 6600 IU, on various skin parameters, have been compared. Patients and methods Seventy-two Korean women aged 40 to 59 years participated in this study. Retinol was used by them for 24 weeks; the effects were measured at 0, 2,doi:10.21203/rs.3.rs-2133775/v1 fatcat:cvnq5qbmbrgt5ev2zuwg6c6ib4