Skin whitening preparation for external use, whitening preparation, whitening method and method of producing skin whitening preparation for external use

Abstract

An external preparation for skin whitening containing 0.001 to 20.0 mass % of an extract of at least one plant selected from the group consisting of Pilea cavaleriei (Urticaceae), Saururus chinensis (Saururaceae), Streptocaulon griffithii (Asclepiadaceae), Toddalia asiatica (Rutaceae) and Tadehagi triquetrum (Leguminosae).

Description

technical field

[0001] The present invention relates to a new whitening agent and an external skin preparation for whitening containing the whitening agent, in particular to an external skin preparation for whitening which can effectively inhibit melanin production and prevent and improve pigmentation such as age spots and freckles. Background technique

[0002] It is generally believed that hyperpigmentation of the skin such as age spots and freckles is caused by excessive formation of melanin due to abnormal secretion of hormones, ultraviolet rays, local skin inflammation, etc., and the melanin is deposited in the skin. Melanin, which is the cause of skin pigmentation, is produced in organelles called melanosomes in pigment cells (melanocytes) present in the basal layer of the epidermis, and the produced melanin is absorbed by surrounding keratinocytes ( Keratinocyte) surrounded. The production process of melanin in the melanin body is as follows, that is, tyrosine is oxi...