How often should I use glycolic acid toner?

How do I know whether to use it more often?

Let irritation, not ambition, determine the schedule. Glycolic acid can be strong and irritating, so increase only when your current frequency causes no irritation. Stronger exfoliation generally needs to happen less often. There is no single schedule for every toner because AHA products come in different concentrations and formulas. Do not jump straight to daily use because another exfoliant suited you.134

Glycolic acid is an alpha hydroxy acid, or AHA, that loosens the bonds between dead surface skin cells so they shed more easily. Regular use can improve uneven colour and texture. The aim is smoother, more even looking skin, not a more impressive bathroom inventory.4

How to fit the toner into your routine

1. 1Test a little toner on a small area before adding it to your facial routine. Watch for a reaction rather than testing several new products together.
2. 2Begin with one or two evening applications per week. Do not exfoliate skin that is sunburned or has open cuts or wounds.
3. 3Follow the toner's directions for application and whether to leave it on or rinse it off. AHA products include both formats; they are not interchangeable.
4. 4Apply moisturizer after exfoliating to help keep skin hydrated.
5. 5Check for dryness, redness or irritation before increasing your frequency. If these develop, do not increase.

What if I already use retinol or other acids?

When starting glycolic toner, avoid combining it with other exfoliating acids, retinol or vitamin C serums. Keeping the number of active ingredients low makes a reaction easier to trace. AHA products can be alternated with retinoid creams or vitamin C rather than applied together. Prescription retinoids and benzoyl peroxide also deserve caution: adding exfoliation can worsen dryness and even cause breakouts.234

Who should be more cautious?

Be cautious with glycolic acid if you have dry or sensitive skin, rosacea, eczema, an active skin infection or skin that is not healing. Avoid aggressive exfoliation if you have darker skin or tend to develop dark spots after skin injury, because it can increase pigmentation. Low concentration glycolic acid is generally considered safe in pregnancy, but check with your healthcare provider before use during pregnancy or breastfeeding.23

Does using it at night remove the sunscreen requirement?

No. Glycolic acid increases sun sensitivity even when applied at night. Use broad spectrum SPF 30 or higher during the day and reapply every two hours. Wear protective clothing and limit sun exposure while using the toner and for a week after stopping; the increased sensitivity can persist beyond your last application.25

How long should I give it?

Home glycolic acid products can take several months of consistent use to produce noticeable brightness or more even pigmentation. Consistency matters for facial acids, which gives the bottle you already own an unfair advantage over the next exciting purchase. Professional peels use higher concentrations and have their own treatment schedules, so do not copy a peel schedule for your toner.126

When should I stop?

If you develop red, itchy or swollen skin, gently wash the product off and stop using it. A cool compress or petroleum jelly can help relieve the reaction. See a dermatologist if the reaction is severe and those measures do not help, or if you cannot identify which product is causing the irritation.7