Mandelic Acid 10% + HA provides a superficial dermal peel that is milder than other alpha hydroxy acids. Mandelic acid has a molecular weight of 152.1 daltons, which exceeds that of other alpha hydroxy acids (for instance, glycolic acid weighs 76.0 daltons). Due to its larger size, mandelic acid penetrates the skin at a slower rate, making it very mild and appropriate for all skin types.