| abstract |
Preventives for skin aging, whereby changes in the appearance caused by skin aging, for example, formation of wrinkles and sags and lessened tension can be prevented or ameliorated. Specifically, preventives for skin aging, which contain phosphonic acid derivatives represented by general formula (1), wherein R?1, R2 and R3¿ represent each hydrogen, etc.; or mercaptopropionamide derivatives represented by general formula (2), wherein R?4, R5 and R6¿ represent each hydrogen, etc.; or salts thereof, whereby formation of wrinkles and lessened tension which cannot be sufficiently prevented by the conventional methods can be efficaciously prevented. |