Methyl rosmarinate is a noncompetitive tyrosinase inhibitor which is isolated from Rabdosia serra, with an IC50 of 0.28 mM for mushroom tyrosinase, and also inhibits a-glucosidase[1]. IC50: 0.28 mM (mushroom tyrosinase), a -glucosidase[1]
[1]. Lin L, et al. Comparative evaluation of rosmarinic acid, methyl rosmarinate and pedalitin isolated from Rabdosia serra (MAXIM.) HARA as inhibitors of tyrosinase and α-glucosidase. Food Chem. 2011 Dec 1;129(3):884-9.