8% L-Mandelic Serum8% 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 all skin types and for skin that needs a boost up from 5% Mandelic Serum.