If you’re looking for brighter, firmer, and more even skin, it’s time to try out some of the best L-ascorbic acid serums ... stable derivatives of vitamin C include magnesium ascorbyl phosphate or ...

Of all the vitamin-C options, our experts generally recommend looking for serums that contain ascorbic acid, also known as L-ascorbic acid ... like magnesium ascorbyl phosphate (MAP) and sodium ...