On the day and night application of glycolic acid
Glycolic acid is quite effective in the field of skin care. The timing of its application is related to day and night, which can be investigated.

During the day, use glycolic acid with caution. When covering the day, the skin faces the sun's exposure. Although glycolic acid can rejuvenate the skin and promote keratin metabolism, it may increase the skin's sensitivity to light. If used during the day and not well protected, the skin may be easily injured by ultraviolet rays, causing sunburn, sunburn, or even pigmentation. Therefore, the use of glycolic acid during the day must be supplemented by comprehensive sun protection measures, such as applying high-multiple sunscreen, supporting parasols, wearing sun hats, etc., to protect the skin from light damage.

As for night, glycolic acid is the best time to exert its capabilities. At night, the skin's metabolism is booming, and glycolic acid can more smoothly exert its exfoliation, dredging pores, and promoting collagen growth. Before going to bed, after cleansing, take an appropriate amount of skin care products containing glycolic acid and apply it evenly to the face, gently massage until absorbed. Overnight, glycolic acid helps the skin repair and renew, and when you wake up the next morning, the skin may be tender, smooth, and shiny.

Then use glycolic acid, no matter day or night, you should test for sensitivity first. Take a small amount and apply it behind the ear or on the inside of the arm. After observing for a few days, if there is no discomfort, it can be used normally. And the initial concentration should be low and gradually increase, so that the skin can adapt to the process and avoid adverse reactions such as allergies, redness, swelling, and tingling.

In short, making good use of glycolic acid day and night, according to the characteristics and needs of the skin, supplemented by appropriate protection and use, can make the skin benefit from maintenance and rejuvenate health.