On the feasibility of glycolic acid for hair use
In recent times, various chemical agents have been widely used in daily use. Glycolic acid has gradually gained fame in the field of skin care, and its ability to exfoliate and rejuvenate the skin is well known. However, whether it can be used in the hair area remains to be tested in detail.

Glycolic acid belongs to an alpha-hydroxy acid, with water-soluble and weakly acidic characteristics. In skin care, it reduces the pH value of the skin surface, loosens the connections between keratinocytes, and makes the old waste keratin fall off, making the skin tender and smooth. However, the structure of hair is very different from that of the skin. The main component of hair is keratin, and the outer hair scales are closely arranged to protect the inner medulla.

If glycolic acid is used rashly on the hair, it may have adverse effects. First, the acidity of glycolic acid or damage to the hair scales. If the hair scales are damaged, the hair water is easily lost, the hair becomes dry and brittle, causing knots and forks. Second, the scalp environment has its specific pH range, about 4.5-5.5, which is weakly acidic. The addition of glycolic acid or changes the acid-base balance, irritates the scalp, causes itching, redness and swelling, and even affects the health of the hair follicles, causing hair loss and other diseases.

However, there are also views that if the concentration of glycolic acid is moderate and the formula is appropriate, it may be used on the hair. Low concentrations of glycolic acid may clean scalp oil, remove dandruff and relieve itching, and control hair damage. However, this still requires rigorous scientific verification and a lot of practical support.

In summary, the use of glycolic acid in hair should be treated with caution before it has been fully demonstrated. In the way of hairdressing, the first heavy hair and scalp are healthy, and it must not be used rashly for novelty, causing hair damage.