Glycolic acid, without the sting

Glycolic acid is the smallest of the alpha hydroxy acids (AHAs), which is why it works quickly — and why it can sting when it is used too often. At 7%, a leave-on toner is a working, everyday concentration. It is not a peel, and it should not feel like one.

What it actually does

Glycolic acid loosens the bonds that hold dead cells to the surface of the skin, so they shed more evenly. Over a few weeks that shows up as smoother texture, less dullness and a more even tone. It does not bleach, strip or burn off anything.

How often to use it

• Weeks 1–2: two or three evenings a week, on clean, dry skin.
• Weeks 3–4: every other evening if your skin is comfortable.
• After that: most evenings, or back off whenever skin feels tight or hot.

A light tingle for a minute is normal. Burning, lasting redness or flaking is your cue to skip a few nights.

What to stop using the same night

Keep the rest of the routine simple on glycolic nights. Avoid retinoids, other exfoliating acids (salicylic, lactic, mandelic), benzoyl peroxide and physical scrubs. Follow with a plain, fragrance-free moisturiser instead.

Why the first week feels like nothing

Skin renews itself over roughly a month, so the first visible change usually arrives around weeks three to four. Increasing strength or frequency to speed that up is the most common reason people end up irritated.

The non-negotiable

AHAs make skin more sensitive to the sun. Wear a broad-spectrum sunscreen of SPF 30 or higher every morning while you use glycolic acid — and for a week after you stop.