To learn how to properly incorporate it into our routines, we spoke with seven skin care experts and tested a handful of formulas to curate this edit of the best vitamin C serums out there.

Many thanks to George Berry, Ewan Klein, Pierpaolo Pantone for key contributions to make VADER better ... please cite the above paper. For example: Hutto, C.J. & Gilbert, E.E. (2014). VADER: A ...