| abstract |
PURPOSE:An external preparation for skin that contains L-phenylalanine, thus having high skin color-lightening and melanine sedimentation-preventing effect after sun burn and showing no side-effects undesirable to human bodies. CONSTITUTION:The objective preparation contains, as an active ingredient L- phenylalanine, or a compound which forms L-phenylalanine by hydrolysis in skins such as its hydrochloride, phosphate salt or a compound of the formula (R is 1-20C alkyl, Na, K, amine). The content of L-phenylalanine is 0.1-30wt%, preferably 0.1-5wt% L-phenylalanine inhibits the activity of tyrosinase to effect remarkable inhibition of melanine formation. |