11% Mandelic Serum is an alpha hydroxy acid serum that contains the chirally correct versions of both L-Mandelic Acid and L-Lactic Acid.  These key ingredients offer exfoliating properties and can help diminish the appearance of discoloration.  Niacinamide offers antioxidant support for the skin.
This water-based serum is appropriate for use on the back or for oily skin types that needs a boost up from 8% Mandelic Serum.  It can be drying so start slowly.