• Citric acid naturally occurs in citrus fruits like lemons, limes, and oranges. Manufactured citric acid is produced from a type of mold called Aspergillus niger and is commonly used as a food ...

Mandelic acid is a type of gentle alpha hydroxy acid (AHA). It may help reduce acne, fine lines, and wrinkles and improve the appearance of uneven skin. As a person ages, skin renewal slows down, ...

Azelaic acid is a type of acid that's found in some grains like rye, wheat, and barley. It's naturally produced by Malassezia furfur (also known as Pityrosporum ovale), a yeast found on healthy skin.