How-To Guide
How to use glycolic acid
Glycolic acid is the best-known alpha hydroxy acid (AHA), a chemical exfoliant that loosens dead surface cells. It works well, but it can sting more than gentler AHAs such as lactic acid. This guide covers the practical part: which format, how often, in what order, and when to step up.
Start with one glycolic acid product, used in the evening two or three times a week on clean, dry skin, then moisturize. Step up frequency before you step up strength, and only if your skin stays calm. Wear sunscreen every morning, because AHAs make skin more sun sensitive while you use them and for about a week after.
- The FDA notes that an expert panel judged consumer AHA products safe at 10% or less with a pH of 3.5 or higher, plus sun protection.
- Glycolic acid increases sensitivity to UV, so daily sunscreen is part of using it, not an optional extra.
- Keep it on different nights from retinoids and other exfoliants, especially at first.
Choose a format
Which glycolic acid product should you start with?
Cleanser
Rinsed off after a short time on the skin, so it is the gentlest way to try glycolic acid. A good first step for dry or easily irritated skin.
Toner or pads
A leave-on layer swept over clean skin. Easy to overuse because it feels light; treat it as an active, not a daily refresher.
Serum or lotion
Stays on the skin longest at a given strength, so it does the most and can sting the most. Best once you know your skin tolerates AHAs.
Professional peels
Peels used in clinics are far stronger (above 20%) and are applied for a set time, then neutralized. They are not a home step. See microneedling vs chemical peel.
Step by step
How to apply glycolic acid
An evening routine for a leave-on product. Always read your product’s own directions too.
- Cleanse and dry
Use a gentle cleanser and pat your skin fully dry before the acid goes on.
- Apply a thin layer
Spread a small amount over the face, avoiding the eyes, lips and the creases beside the nose. Do not rub hard.
- Let it dry
Give it a short time to settle before the next step. A brief tingle can be normal; burning is not.
- Moisturize
Follow with a plain moisturizer. The AAD advises moisturizing right after exfoliating to keep skin hydrated.
- Protect the next morning
Use broad-spectrum sunscreen every morning. The FDA suggests sun protection while using AHAs and for a week after stopping.
Frequency and strength
How to build up frequency and strength
| Stage | What to do | Move on when |
|---|---|---|
| First few weeks | Low-strength product, two or three evenings a week | Skin feels comfortable the next morning |
| Next step | Add one more evening a week, same product | No lasting redness, stinging or flaking |
| Optional | More evenings, only if your skin is oily or resilient | Only if you see a benefit; more is not required |
| Stronger product | Try a higher strength only after frequency is settled, and drop back to fewer nights | You have used AHAs comfortably for some time |
| Any time | Skip a few nights and use moisturizer only | Skin stings with plain products or looks shiny and tight |
What to pair it with
What can you use glycolic acid with?
| With | Same night? | What to know |
|---|---|---|
| Moisturizer, ceramides, glycerin | Yes | These help offset dryness. Apply after the acid. |
| Niacinamide | Usually yes | A common, well-tolerated partner. Separate them if the combination stings. |
| Retinol or other retinoids | No, alternate nights | Both irritate; the AAD warns exfoliating while on retinoids may worsen dryness. See glycolic acid with retinol. |
| Salicylic acid (BHA) | Not at first | Start with one acid. See can you use AHA and BHA together. |
| Benzoyl peroxide | Usually not | The AAD lists benzoyl peroxide among products that make skin more sensitive to exfoliation. |
| Scrubs or brushes | No | Doubling up on exfoliation is the most common way to over-exfoliate. |
Do and avoid
Getting results without irritation
Do
- Patch test a new product first; see how to patch test skincare.
- Change one thing at a time: frequency first, strength later.
- Choose a gentler AHA such as lactic or mandelic acid if glycolic acid keeps stinging.
- Wear sunscreen daily and reapply on long days outdoors.
Avoid
- Using it on sunburned, broken, freshly shaved or waxed skin.
- Adding a second acid, a scrub or a peel pad on the same night.
- Strong exfoliation if you have a darker skin tone or dark spots; the AAD warns aggressive exfoliation can increase pigmentation.
- Pushing through stinging that lasts or skin that looks raw.
Overdone it? Stop all acids and use a plain cleanser and moisturizer until your skin settles. Over-exfoliated skin explains recovery.
Before you start
Is glycolic acid the right acid for you?
Glycolic acid suits rough, dull or sun-damaged skin that is not very sensitive. A review of hydroxy acids, the family glycolic acid belongs to, says nonprescription creams and lotions usually contain about 4% to 10%, while peels used in clinics are above 20%.
If your main concern is clogged pores, a BHA usually fits better; if your skin is dry or reactive, lactic or mandelic acid may be easier. This guide does not repeat the full profile, so see glycolic acid for how it works and should you use glycolic acid to decide whether it fits.
- Compare gentler options in glycolic acid vs lactic acid.
- Overall exfoliation limits are in how often should you exfoliate.
Safety and professional-help boundaries
When glycolic acid needs more than a routine change.
- Stop and seek medical advice for swelling, blistering, oozing or a rash that spreads beyond where you applied the product.
- If stinging, redness or peeling continues after several days off all acids, see a pharmacist or doctor.
- Do not use home acids before or after a professional peel, laser or other procedure unless the clinician agrees.
- If you are pregnant or breastfeeding, check with your clinician before starting a new active.
- See a dermatologist for dark patches that keep returning, such as melasma, rather than exfoliating harder.
Frequently asked questions
Short answers to common questions
How often should I use glycolic acid?
Start two or three evenings a week. If your skin stays comfortable, you can add nights gradually, but many people never need more. A dermatologist quoted by Harvard Health advises exfoliating two or three times a week at most, so skin can repair in between.
Can I use glycolic acid every day?
Some people with oily or resilient skin tolerate a low-strength product daily, but it is not necessary. Daily use plus other actives is a common cause of irritation.
Do I apply glycolic acid before or after moisturizer?
Apply it to clean, dry skin first, then moisturizer once it has settled. A glycolic cleanser is the exception: use it, rinse, then moisturize.
Should I use glycolic acid in the morning or at night?
Evening is easiest, because it keeps the acid away from your morning sunscreen routine and other daytime products. You still need sunscreen the next day.
What percentage of glycolic acid should a beginner use?
Start at the low end of what is sold for home use. The FDA notes that consumer AHA products were judged safe at 10% or less with a pH of 3.5 or higher.
Does glycolic acid make you sensitive to the sun?
Yes. The FDA reports that in one study, four weeks of AHA use made skin more prone to UV reddening, and this faded within about a week of stopping.
Is tingling normal with glycolic acid?
A brief, mild tingle can be normal. Burning that lasts, or stinging when you apply plain moisturizer, means you should cut back.
Editorial Record
- Editorial status
- reviewed
- Medical reviewer
- Dr. Abdurrahman Efem
- Practical reviewer
- Merve Akkaya
- Last reviewed
- November 13, 2026
Related pages
Continue from here
Sources reviewed
Evidence behind this guide
- US Food and Drug Administration: Alpha hydroxy acids.
- American Academy of Dermatology: How to safely exfoliate at home.
- Kornhauser A, Coelho SG, Hearing VJ. Applications of hydroxy acids: classification, mechanisms, and photoactivity. Clinical, Cosmetic and Investigational Dermatology, 2010;3:135-142.
- Tang SC, Yang JH. Dual effects of alpha-hydroxy acids on the skin. Molecules, 2018;23(4):863.
- Salamon M. Have you exfoliated lately? Harvard Health Publishing, 2024.
Sources support the general editorial guidance shown here. They do not replace personal medical advice from a qualified clinician.