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Ingredient dictionary

Glycolic Acid

Also listed as: Hydroxyacetic Acid

Glycolic acid is a small alpha hydroxy acid, the smallest of its family, that gently loosens dead skin cells and helps skin look smoother and brighter. It is on the label of 28 products in our library. Checked against our library November 6, 2026.

The catch: can sting or irritate sensitive skin, and it can make skin more sensitive to the sun, so daily sunscreen is a good habit.

What Glycolic Acid does

  • Loosens bonds between dead skin cells
  • Helps skin look smoother and brighter
  • Adjusts the pH of some formulas

Glycolic acid is found naturally in sugar cane and is also made in the lab. Its molecule is very small, which helps it move into the outer layer of skin. Formulators use it because it gently loosens the glue-like bonds between dead skin cells, which helps the surface feel smoother and look more even.

In a formula, its strength depends partly on the product's pH, which is how acidic or basic it is. Many people feel a light tingle at first, and this usually fades as skin adapts. In hair products, it is used in a similar gentle way to clear buildup from the scalp.

Good for

Suits people with dull, rough-feeling skin who want a gentle exfoliating step in their routine.

Frequently asked questions

Is glycolic acid safe to use every day?

Many people use it daily at low strengths, but skin can need time to adjust. Start slowly, watch for redness or stinging, and wear sunscreen during the day, since glycolic acid can increase sun sensitivity.

Does glycolic acid work on hair?

It can be used in some hair and scalp products to help clear product buildup and dead skin cells from the scalp. Results vary by formula. Hair masks and cleansers are the most common places to find it.

Products with Glycolic Acid

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Amazon UK prices as of 6 November 2026, 06:08 GMT; Amazon sets the final price at checkout.