To obtain a skin-beautifying preparation for external use for skin having excellent prevention and improvement effects on melanopathy by the melanogenesis suppressing action and free from safety problem by including a specific compound represented by kurarinone.
A compound of formula I (R1 is an alkenyl; R2 to R5 are each H, OH, a 1-4C alkylorxy or a 1-4C acyloxy), e.g. kurarinone of formula II is included in the objective preparation in an amount of 0.005-10 wt.% based on the total preparation. Kurarinone which is the most preferable compound among the compounds of formula I can be produced by extracting and purifying a plant such as Kujin (Sophorae radix). The preparation for external use may be incorporated with, in addition to the compound of formula I, various components usually used in pharmaceuticals and cosmetics, or the like, such as water-based component, oily component, powdery component, surfactant and humectant.
KATO TOMOYOSHI
KANAMARU AKIKO
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