Mandelic acid is an alpha hydroxy acid (AHA) extracted from bitter almond that has been studied extensively as a treatment for common skin concerns as photoaging, acne and melasma. Its use was developed by the doctor behind Retin-A and found to be extremely effective for adult acne due to its unique anti ageing properties and unique antibacterial properties. It can be used by individuals with rosacea, active acne cysts and pimples. Despite being stronger, it is less irritating than glycolic acid and can be used safely on dark skin. This makes Mandelic Acid the top choice for anyone looking to benefit from the benefits of Alpha Hydroxy Acid skincare. Because Mandelic acid is an exfoliant, it will expose new layers of skin to the sun. The newer skin will tend to be slightly more vulnerable to the sun. As with all AHA products, a sunscreen is recommended.