How does lactic acid differ from other AHAs?

Lactic acid has a larger molecular size than glycolic acid, making it a milder exfoliant. It also has humectant properties, meaning it helps to hydrate the skin while exfoliating, which can be beneficial for drier skin types.

Can I use lactic acid every day?

The frequency of use depends on the concentration and your skin's tolerance. Starting with a lower concentration a few times a week and gradually increasing can help prevent irritation. Always use daily sunscreen when using lactic acid.

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Lactic Acid

Lactic acid is an alpha hydroxy acid (AHA) derived from milk or plant sources. It works by gently exfoliating the skin's surface, helping to remove dead skin cells and improve skin texture. It also acts as a humectant, drawing moisture into the skin, making it a good choice for those seeking both exfoliation and hydration.

AhaAlpha hydroxy acid (AHA)Evidence: High

BenefitStrong 3.5 / 4

Texture

Pigmentation

Hydration

Anti aging

Acne

Barrier support

RiskModerate 2 / 4

Photosensitivity

Irritation

Barrier disruption

Eye irritation

Sensitization

Rated by SpottyLabs' ingredient methodology, independent of brands.

What it helps with

Exfoliates dead skin cells
Improves skin texture
Boosts hydration
Reduces hyperpigmentation

Things to watch

Can cause irritation, especially at high concentrations
Increases sun sensitivity
Requires daily SPF use

Pairs well with

Niacinamide — Niacinamide can help soothe skin and reduce potential irritation from AHAs.
Hyaluronic Acid — Hyaluronic acid provides additional hydration, complementing lactic acid's humectant properties.

Be careful combining with

Retinoid — Combining with retinoids can increase irritation and sensitivity; use on alternate nights or consult a professional.
Vitamin C — Using with L-ascorbic acid can reduce the efficacy of both and increase irritation; use at different times of day.

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Products with Lactic Acid

Multi‑Peptide Serum for Hair Density

Score 3.8 / 5

Perfect Hair Day High‑Shine Gloss

Score 3.8 / 5

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Frequently asked questions

How does lactic acid differ from other AHAs?: Lactic acid has a larger molecular size than glycolic acid, making it a milder exfoliant. It also has humectant properties, meaning it helps to hydrate the skin while exfoliating, which can be beneficial for drier skin types.
Can I use lactic acid every day?: The frequency of use depends on the concentration and your skin's tolerance. Starting with a lower concentration a few times a week and gradually increasing can help prevent irritation. Always use daily sunscreen when using lactic acid.