Mandelic acid is an aromatic alpha hydroxy acid with the molecular formula C6H5CH(OH)CO2H. It is a white crystalline solid that is soluble in water and polar organic solvents.
It's derived from sugar cane and is effective at exfoliating skin, reducing fine lines, and preventing acne, according to a 2009 study. ... Mandelic acid has been found to be effective for inflammatory acne and some forms of hyperpigmentation, as well as treating sun damage and evening out pigmentation.
Mandelic acid can lighten and brighten skin, fade unwanted sun spots, banish acne scars, and minimize age spots. With continued use, you'll see damage from aging and sun exposure slowly reverse.