Ingredient Guide

Glycolic Acid

Also known as: AHA, Alpha-Hydroxy Acid, Glycolic

NormalCombinationOilyExperienced acid users

What It Is

The smallest alpha-hydroxy acid (AHA), derived from sugar cane. Widely used in chemical exfoliation for its ability to break down the bonds between dead skin cells.

What It Does

Exfoliates the skin's surface, promotes cell turnover, improves texture and tone, reduces the appearance of hyperpigmentation, and stimulates collagen over time.

Best For

Dull skinUneven textureHyperpigmentationRough surfacePost-acne surface concerns

Benefits

  • Most studied AHA — backed by decades of clinical research
  • Visible improvement in texture and radiance
  • Fades post-acne marks and surface hyperpigmentation
  • Stimulates collagen production with consistent use
  • Also effective on the body for rough or bumpy skin

When to Be Careful

  • Increases photosensitivity — daily SPF is mandatory
  • Can cause irritation, peeling, and stinging on sensitive or compromised skin
  • Easy to over-use — daily application is often unnecessary and counterproductive
  • Not appropriate for rosacea-prone or highly reactive skin
ItGirlies Ingredient Intelligence
Why This Gets Hype

Glycolic acid is the OG exfoliating acid. Decades of clinical research and an accessible price point (especially through The Ordinary) made it the go-to for anyone wanting a glow-promoting exfoliant.

What People Often Misunderstand

More frequent use does not equal faster results. Glycolic acid increases skin sensitivity over time when overused. 2–3x per week is often more effective and less damaging than daily use.

Best Routine Slot

Evening only, after cleansing on dry skin, before moisturizer. Do not layer directly with other exfoliating actives.

Good Match For

Normal to combination skin types, people with dull skin, uneven texture, or surface hyperpigmentation who are comfortable with chemical exfoliants.

Proceed Carefully If…

Sensitive skin, rosacea, anyone new to acids, compromised barriers, or anyone not committed to daily SPF use.

Signs You May Be Overdoing It

Persistent redness, tightness that doesn't resolve, stinging on application, increased breakouts, or raw-feeling skin after use.

Commonly Found In

Exfoliating tonersChemical peelsSerumsCleansers

Products Containing Glycolic Acid

Glycolic Acid 7% Exfoliating Toner
The Ordinary
AHA 30% + BHA 2% Peeling Solution
The Ordinary

FAQs About Glycolic Acid

Is The Ordinary Glycolic Acid Toner too strong?
At 7%, it's on the stronger end for an OTC toner. Beginners should start 1–2x per week. Those with sensitive or dry skin should approach cautiously or choose a lower concentration.
How often should I use glycolic acid?
Starting point: 1–2x per week. Maximum for most people: 3–4x per week. Daily use is rarely necessary and increases irritation risk.
Can I use glycolic acid with retinol?
Not in the same routine — it's too much exfoliation. Alternate on different evenings instead.
Do I need SPF after using glycolic acid?
Yes — non-negotiable. AHAs increase photosensitivity, so daily SPF 30+ is required when using glycolic acid regularly.
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