What is glycolic acid?
Glycolic acid belongs to the alpha hydroxy acid group (AHA), originating from sugarcane and possessing small molecular sizes, making it easy to penetrate deep into the skin. This active ingredient works by removing dead skin cells on the surface, promoting the process of regenerating new skin, thereby improving skin tone, skin texture, acne spots and early signs of aging.
However, the ability to exfoliate strongly also weakens the temporary skin protection barrier, making the skin more sensitive to sunlight and environmental factors.
What is the appropriate time to use glycolic acid?
According to Dr. Ruben Bhasin Passi, a dermatologist consultant at CK Birla Hospital (Gurugram, India), glycolic acid should only be used in night skin care routines. Applying this active ingredient in the evening helps limit the risk of skin being directly exposed to ultraviolet rays, thereby reducing irritability, increased pigmentation and melasma.
Dr. Passi said that when glycolic acid removes the layer of dead cells on the surface, the skin becomes more sensitive. If used during the day, even with sunscreen, the skin is still easily damaged and the protective effect may be reduced.
Why is night the ideal time?
Nighttime is the stage when the skin enters the process of natural recovery and regeneration. Using glycolic acid at this time helps the skin have enough time to absorb active ingredients and self-correct while sleeping, while avoiding the effects of sunlight, pollution and high temperatures.
According to experts, glycolic acid should be applied after the skin cleansing step, then using moisturizer to soothe and support the restoration of the skin's protective barrier. This helps reduce the risk of irritation and optimize skin care efficiency.
How to use glycolic acid safely
The process of using glycolic acid should be simple and scientific. After washing your face with a gentle cleanser, apply a product containing glycolic acid as instructed, then moisturize with appropriate moisturizer. Do not combine glycolic acid with other strong active ingredients such as retinol, vitamin C or benzoyl peroxide in the same evening if not prescribed by a dermatologist. Wide-spectrum sunscreen the next morning is a mandatory step to protect the skin.
Who needs special caution?
People with sensitive skin, inflammation, dampness, facial redness, or weak skin barriers should start with a low concentration, about 5-7%, and only use it once or twice a week. Testing the product on a small area of skin before use for the entire face is necessary to limit irritation.
