On whether it is appropriate to use both glycolic acid and kojic acid
Avoglycolic acid and kojic acid are both nourishing things for the skin, but the advantages and disadvantages of using both are unknown. Let's discuss it now.

Glycolic acid belongs to alpha-hydroxy acid, which can reach the stratum corneum of the skin smoothly, make the old keratin fall off, and the skin is rejuvenated. It can also increase the hydration of the skin, promote collagen production, and make the skin firm and shiny. Kojic acid is derived from microbial fermentation. With its excellent ability to inhibit tyrosinase activity, it is often used to lighten pigmentation and smooth skin tone.

As for whether the two can be used together, the first consideration should be given to the characteristics of the skin. If the skin is sensitive and weak, use both, or cause skin intolerance. Glycolic acid has the property of exfoliation. Although kojic acid is relatively mild, it may increase the risk of skin irritation if applied together. Skin redness, itching, tingling and other symptoms may occur. Therefore, if you want to use both sensitive and weak skin, you should try it on a small area of skin first, observe its reaction, and then use it gradually without discomfort.

In addition, the chemical properties of the two must also be considered. Glycolic acid is acidic, and kojic acid also has certain acidic characteristics. When used together, if the pH value is not properly regulated, it may damage the skin barrier. The ideal method is to choose a suitable dosage form, such as lotions, creams, etc. The formula has been carefully prepared to slow down the acidic irritation of the two. And when using, the dosage should be gradually adjusted according to the skin's tolerance, starting with a small amount, and then increasing it when the skin adapts.

In addition, when using it during the day, it is especially necessary to use heavy sun protection. When glycolic acid and kojic acid are used together, the skin's sensitivity to ultraviolet rays may rise. If it is not protected, it is easy to turn black and damage the skin's recuperation. Therefore, after daytime use, it is advisable to apply high-efficiency sunscreen to avoid direct sunlight.

In summary, the combination of glycolic acid and kojic acid must be used. For those with sensitive and weak skin, be cautious, try sensitivity first, and control the dosage; for those with normal skin, you should also pay attention to sunscreen and adjust the usage according to the skin state. In this way, you may be able to use both to avoid harm and get the good effect of skin recuperation.