Glycolic Acid: Real Benefits and How to Introduce It

Glycolic acid is the smallest of the alpha hydroxy acids. That size isn't a detail: it's what lets it penetrate deeper than lactic or mandelic acid — and it's also what makes it easier to overdo.

What it does

It dissolves the cement holding dead cells together. They detach without friction, which produces three measurable effects:

• Texture refines. The fastest visible effect, often within three weeks.
• The complexion gains light. A cluttered stratum corneum scatters light badly — that's what a dull complexion is.
• Dark spots fade faster. Part of the pigment sits in the surface layers — the mechanism is detailed in our piece on dark spots.

What it doesn't do: fill an established wrinkle, shrink a pore, or replace sunscreen. On the contrary, it makes skin more UV-sensitive — a point we return to below.

What strength to start at

In consumer cosmetics you'll typically find 5 to 10%. Below 5%, the exfoliating effect is marginal. Above 10% without supervision, the risk-benefit ratio degrades quickly: more redness, no more result.

pH matters as much as concentration — an acid at pH 4 works, the same at pH 6 does almost nothing. Few brands publish it.

If your skin tightens easily, a night-cream version is more comfortable: the fat phase slows penetration and softens the effect.

How to introduce it

1. Weeks 1 and 2: two nights a week, on clean dry skin.
2. Weeks 3 and 4: three nights, if there's no persistent redness.
3. After that: settle wherever your skin is comfortable. There's no benefit to going higher.

Always a moisturiser on top, and always sunscreen the next day.

The three mistakes that damage

1. Combining it with a scrub the same night

Chemical and physical exfoliation on the same day, and it's the skin barrier that pays. Leave at least two days between them.

2. Taking stinging as a sign it's working

Mild passing warmth is normal. Burning, or redness still there the next day, means the barrier is giving way. Stop for a week.

3. Skipping sunscreen

Exfoliated skin is more vulnerable to UV. Without sunscreen you create exactly the spots you were trying to fade. TORVIA doesn't sell sunscreen — get one elsewhere, SPF 30 minimum.

What to combine it with

• Niacinamide: yes, but separately — niacinamide morning, acid night. See our article.
• Hyaluronic acid: yes, without reservation, same night included. It soothes rather than aggravates.
• Retinol: never the same night. Alternate.
• Vitamin C: morning if you use it, never layered over the acid.

Frequently asked

Glycolic or lactic?

Lactic is larger, penetrates less and hydrates more: it's the choice for sensitive skin. Glycolic goes further and works better on texture.

Can you use it on the body?

Yes, particularly on arms and thighs. The skin there is thicker and tolerates it better.

How long does it take?

Texture: three to four weeks. Radiance: two to three weeks. Dark spots: eight to twelve weeks, and never completely.

The full INCI list for every formula is published on its product page.