Glycolic acid is often used for hair, and everyone doubts it. Or: "Glycolic acid, which is often used by the skin, can rejuvenate the skin, exfoliate and make the skin smooth. However, hair is different from skin, its quality is different, and its structure is different. Can it be used for hair by those who use skin?"

A good researcher said: "The main ingredient of hair is keratin. Although glycolic acid is acidic, it acts on hair, or has different effects. If the concentration is moderate, it may affect the surface structure of hair, making it easier to absorb and nourish. However, high concentrations of glycolic acid may damage the stratum corneum of hair, causing hair to dry and break easily."

There are also hair care experts who say: "When using glycolic acid on hair, you must be careful. Test the ends of the hair first to see if there is any discomfort, such as discoloration, brittleness, etc. After use, you must wash it with water to prevent residual acid from continuing to hurt the hair."

In short, common glycolic acid is used for hair, and the advantages and disadvantages coexist. Those who use it need to carefully observe the hair quality and use it carefully, so that it can be beneficial but harmless.