Question 1

Can I use glycolic acid every day?

Accepted Answer

It depends on the concentration and your skin's tolerance. Low-concentration products (5-10%) such as toners and serums can often be used daily once your skin has acclimated, while higher-concentration treatments (15%+) should be used less frequently  - typically once or twice a week. Always start with every other day and increase frequency gradually based on how your skin responds.

Question 2

Should I use glycolic acid in the morning or at night?

Accepted Answer

Night application is generally preferred because glycolic acid increases photosensitivity, and your skin undergoes natural repair processes while you sleep. If you do use it in the morning, a broad-spectrum SPF 30 or higher sunscreen is absolutely essential  - though daily sunscreen is recommended regardless of when you apply glycolic acid.

Question 3

What percentage glycolic acid should a beginner use?

Accepted Answer

Beginners should start with a concentration between 5% and 7%. This range provides noticeable exfoliation without overwhelming the skin barrier. After 4 to 6 weeks of consistent use without irritation, you can consider moving up to 10%. Leave-on products at these concentrations are widely available as toners, serums, and moisturizers.

Question 4

Can I use glycolic acid with retinol?

Accepted Answer

Yes, but introduce them carefully. The safest approach for beginners is to alternate nights  - glycolic acid one evening, retinol the next  - rather than layering them in the same routine. Both ingredients promote cell turnover, so using them together can cause excessive dryness and irritation. Once your skin has built tolerance to each individually, some people successfully use both in a single routine by applying retinol first and glycolic acid second.

How to Use Glycolic Acid