What AHAs do for your skin

AHA (Glycolic / Lactic Acid) · Alpha Hydroxy Acid · Glycolic Acid · Lactic Acid

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AHAs (glycolic and lactic acid) are surface exfoliants that sweep away dull, rough-looking dead skin. In cosmetic terms they refine and brighten, and they're one of the faster-acting actives: many people see a smoother, glowier look within a week or two.

What AHA is

Alpha hydroxy acids work on the very surface of the skin, which is why the glow shows up quickly. Gentle at-home strengths (roughly 5 to 10%) are the everyday range. The one non-negotiable: AHAs make skin more sun-sensitive, so daily SPF isn't optional while you use them.

What AHA is good for

a dull, rough-looking surface that wants a quick glow
uneven-looking texture
a tired, flat-looking complexion
anyone who likes fast, visible smoothness

How to use it

Usually a night active; start 2 to 3 times a week.
Gentle 5 to 10% strengths are right for home use.
Daily SPF is essential while you use an AHA.
If skin feels tight, scale back the frequency.

What it pairs with

Keep AHAs away from other strong actives (retinoids, benzoyl peroxide, BHA and pure vitamin C) in the same routine. Baselit builds the spacing in for you.

AHA for specific concerns

glycolic acid for dull skin

sweeps away a dull, rough-looking surface for a quick glow

AHA for texture

refines an uneven-looking, rough surface

lactic acid for sensitive skin

lactic acid is the gentler AHA for skin that reacts easily

glycolic acid for uneven tone

helps even the overall look of the complexion over time

Frequently asked questions

What does AHA do for skin?

In cosmetic terms, AHAs like glycolic and lactic acid refine and brighten. They're surface exfoliants that sweep away dull, rough-looking dead skin, so skin looks smoother and glowier, often within a week or two.

How quickly does glycolic acid work?

AHAs are among the faster-acting actives for a visible glow. Many people notice a smoother, brighter look within one to two weeks of consistent use.

Do I need sunscreen with AHAs?

Yes, and it's non-negotiable. AHAs make your skin more sun-sensitive, so daily broad-spectrum SPF is essential the whole time you use them.

What's the difference between glycolic and lactic acid?

Both are AHAs. Glycolic is the smaller, more intensive one; lactic acid is gentler and a good pick for skin that reacts easily. Both refine and brighten the surface.

Can I use an AHA every day?

Start 2 to 3 times a week rather than daily. If your skin feels tight, scale back. Over-exfoliating does more harm than good, so let your skin set the pace.

Baselit is a cosmetic skin-analysis app, not medical advice. This guide describes what ingredients do for the look and feel of skin. It is not a diagnosis or treatment, and it is no substitute for a doctor or dermatologist.