The Ordinary Mandelic Acid 10% + Hyaluronic Acid Serum 30mlMandelic Acid 10% + HA is an Alpha Hydroxy Acid serum that helps improve the look of skin clarity by balancing uneven skin tone, and correcting the look and feel of skin texture in a gentle, yet effective manner. This is because it has a larger molecular weight than other alpha hydroxy acids, which results in a slower, more balanced distribution.