Alpha hydroxy acids (AHAs) are naturally occurring carboxylic acids such as glycolic acid, a natural constituent of sugar cane juice and lactic acid, found in sour milk and tomato juice. This is the mildest of the peel formulas and produces light peels for treatment of fine wrinkles, areas of dryness, uneven pigmentation and acne. Alpha hydroxy acids can also be mixed with a facial wash or cream in lesser concentrations as part of a daily skin-care regimen to improve the skin's texture.

There are five usual fruit acids: citric acids (citrus-derived), glycolic acid (derived from sugar cane), lactic acid (although derived from milk, this is still considered a "fruit acid"), malic acid (derived from apples) and tartaric acid (derived from grapes). Many other alpha hydroxy acids exist and are used.

  • Citric acid: Usually derived from lemons, oranges, limes and pineapples. These peels are simple and effective, although not incredibly invasive or capable of significant improvement with one treatment.
  • Glycolic acid: Formulated from sugar cane, this acid creates a mild exfoliating action. Glycolic acid peels work by loosening up and exfoliating the superficial top layer. This peel also stimulates collagen growth. High strength peels are good in terms of efficacy but they irritate more. Some glycolic peels claim the use of strontium nitrate in order to try to reduce skin irritation. Nevertheless, strontium nitrate is a product which is strictly prohibited in cosmetic products since it has an high toxic potential
  • Lactic acid: This acid is derived from either sour milk or bilberries. This peel will remove dead skin cells, and promote healthier skin.
  • Malic acid: This peel is the same type of mildly invasive peel derived from the extracts of apples. It can open up the pores, allow the pores to expel their sebum and reduce acne.
  • Tartaric acid: This is derived from grape extract and is capable of delivering the same benefits as the above peels.

AHA peels are not indicated for treating wrinkles.

AHA peels may cause stinging, cause skin redness, cause mild skin irritation, cause dryness, and take multiple treatments for desired results.

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