AHA (Alpha Hydroxy Acids)

Also known as alpha hydroxy acids, glycolic acid, lactic acid, mandelic acid

What are AHAs?

AHAs are water-soluble acids that loosen the bonds holding dead skin cells to the surface of your skin. With steady use they smooth rough texture, brighten dull skin, and soften fine lines. Glycolic, lactic, and mandelic acid are the three you'll see most often.
Best forDull skin Rough texture Fine lines Dark spots

Pairs well with

  • Hyaluronic acid
  • Ceramides
  • Niacinamide
  • Sunscreen

Use with caution

  • Retinol on the same night
  • Other exfoliating acids
  • Benzoyl peroxide
  • Freshly waxed or sunburned skin

AHA FAQs

Start with two or three nights a week. You can move to every other night once your skin stops stinging or flaking.

AHAs work on the surface of your skin, and BHA works inside the pore. AHAs suit dry, dull, or sun-damaged skin, and BHA suits oily skin with clogged pores.

You need SPF 30 or higher every morning. AHAs make your skin burn faster for about a week after each use.

Mandelic acid is the gentlest, followed by lactic acid. Glycolic acid is the strongest because it has the smallest molecule.

Related reading

AHA and BHA: a guide to exfoliating acids Chemical vs physical exfoliants Glycolic acid vs lactic acid

This content on this page is for general information only and is not medical advice. Always speak to a dermatologist before starting a new skincare routine.