On whether it is feasible to leave glycolic acid on the hair overnight
or ask: "Can glycolic acid be left on the hair overnight?" This matter is related to hair care, and people have different opinions, so it should be discussed in detail.

The glycolic acid is often used in skin care, with the ability to exfoliate and promote metabolism. However, hair is very different from skin, and the structure of hair has its own unique structure. The outer layer is hair scales. If properly cared for, the hair is tightly arranged, and the hair is soft and shiny; if damaged, the hair scales are tilted, and the hair is rough and easy to break.

If glycolic acid is left on the hair overnight, its acidity may affect the hair scales. The acidity of glycolic acid may open the hair scales. Although it may make nutrients more likely to penetrate for a short time, it will act for a long time overnight, or cause the hair scales to open excessively and make it difficult to close. In this way, the internal moisture of the hair is easy to lose, the hair is easy to dry, fragile, and even more, it may cause the risk of bifurcation and breakage.

And the environment in which the hair is located is different from the skin, and the scalp secretes substances such as oil and interacts with the hair. Glycolic acid is left on the hair overnight, or disrupts this balance and affects the microecology of the scalp. The scalp may breed microorganisms such as bacteria due to changes in pH, causing scalp itching, inflammation and other problems, which in turn affect the healthy growth of hair.

However, there are also views that if the hair is seriously damaged, moderate use of glycolic acid on the hair overnight may improve the hair condition. However, it is necessary to precisely control the concentration and frequency of use, and your mileage may vary. Those with coarse hair and strong tolerance may try to leave a lower concentration of glycolic acid on the hair overnight; and those with soft and sensitive hair must not do it rashly.

In summary, the matter of leaving glycolic acid on the hair overnight needs to be done with caution. First clarify the characteristics of your own hair, and test it on a small part of the hair to see its reaction. If there is no discomfort, then consider whether to expand the scope of use. Do not leave glycolic acid on your hair overnight to avoid damaging hair health.