What are alpha hydroxy acids?
Alpha hydroxy acids or AHAs are a group of organic carboxylic compounds including glycolic acid (from sugar cane), citric acid (from citrus fruit), lactic acid (from milk and pickled vegetables), malic acid (from apples) and tartaric acid (from grapes).
Glycolic acid and lactic acid are often used in cosmetics to rejuvenate the skin.
How do AHA treatments work?
With time and sun exposure there is a gradual but slow-down in the rate at which old cells leave the surface of the skin and are replaced by newer cells. This results in a surface layer of dead skin cells that are responsible for the appearance of aged skin. Alpha hydroxy acids encourage the shedding of old, sun-damaged surface skin cells.
They loosen the glue-like substances that hold the surface skin cells to each other, therefore allowing the dead skin to peel off gently. The skin underneath has a fresher, healthier look with a more even colour and texture.
With high concentration and long-term use, alpha hydroxy acids may also affect the deeper layers of the skin. Collagen and elastin regenerate making fine lines less obvious.
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