Mandelic acid is an alpha-hydroxy acid (AHA), which works to lighten your skin by reducing the amount of melanin your skin produces – Melanin gives your skin a darker pigment.
Mandelic acid has been tested a lot in clinical trials, and the results have been extremely positive. As well as helping to lighten the skin, mandelic acid is also very safe. Many dermatologists refer to mandelic acid as a “non-irritating” ingredient.
Mandelic acid has also been very effective for treating hyperpigmentation and melasma.