Hydroxy Acid, also known as Alpha-hydroxy acids (AHA), are a group of exfoliating acids used in skincare. The term "Hydroxy Acid" is pronounced /haɪdrɒksiː/ or HIGH-drok-see. The word "Hydroxy" originates from the Greek word "hydor", meaning water, and "oxy", meaning acid, thus the combination forms "water acid". The structure of the compound includes a hydroxyl group (-OH) and a carboxylic acid group (-COOH), giving it its name. Hydroxy Acids are commonly used in skincare as they help to exfoliate the skin by breaking down dead skin cells and promoting cell turnover.
Hydroxy acids (also known as alpha hydroxy acids or AHAs) are a group of naturally occurring or synthetic chemical compounds that are commonly used in skincare products for their exfoliating and rejuvenating properties. These acids are characterized by the presence of one or more hydroxyl (-OH) groups attached to a carbon atom in their molecular structure.
There are several types of hydroxy acids, with the most commonly used ones being glycolic acid (derived from sugarcane) and lactic acid (found in milk). Other hydroxy acids include citric acid (from citrus fruits), malic acid (from apples), and tartaric acid (from grapes).
In skincare, hydroxy acids work by gently dissolving and removing the outer layer of dead skin cells, promoting cell turnover and revealing smoother, brighter skin underneath. This exfoliating action can help improve the appearance of wrinkles, fine lines, acne scars, and uneven skin tone. Hydroxy acids also have the ability to penetrate the skin, stimulating collagen production and increasing moisture levels.
It is important to note that hydroxy acids, particularly in higher concentrations, can cause skin irritation, redness, and increased sensitivity to sunlight. Therefore, it is recommended to start with lower concentrations and gradually increase usage, always following product instructions and using sunscreen during the day.
Overall, hydroxy acids are widely used in skincare products due to their proven efficacy in promoting a more youthful and radiant complexion.
The word "hydroxy acid" is a combination of two terms: "hydroxy" and "acid".
"Hydroxy" is derived from the Greek word "hýdōr" meaning "water" and the suffix "-oxy" meaning "containing oxygen". Therefore, "hydroxy" indicates the presence of a hydroxyl group (-OH), which consists of one atom of oxygen and one atom of hydrogen.
On the other hand, "acid" comes from the Latin word "acidus" meaning "sour". It refers to a chemical substance that has a sour taste and can react with bases to form salts.
Therefore, the term "hydroxy acid" describes a compound that contains both a hydroxyl group and acidic properties.