AHAs are a group of acids extracted from various sources such as sugar cane, fruits, sour milk, apples, grapes etc. Some of the most common AHAs are glycolic acid, lactic acid, malic acid and citric acid. When applied to the skin, AHAs work by loosening the bonds between dead skin cells, making it easier for the skin to regenerate itself and leaving behind a brighter, smoother complexion. Chemically produced AHAs may involve the use of synthetic ingredients or harsh chemicals in the manufacturing process. There are some natural alternatives such as Hibiscus extract.