Facial Cleanser with Lactic Acid: What It Does in a Wash, and Who It Suits

What does a facial cleanser with lactic acid do?

A lactic acid cleanser combines washing with a mild chemical exfoliation. Lactic acid is an alpha hydroxy acid (AHA) that loosens dull surface skin, so skin looks smoother and brighter. In a rinse-off wash it is a gentle way to use an acid. The FDA advises sun protection whenever you use AHAs.

What lactic acid is

Lactic acid belongs to the alpha hydroxy acid family. The FDA notes that the two most common AHAs in cosmetics are glycolic acid and lactic acid.

The FDA describes what AHAs do in plain terms: they "cause exfoliation, or shedding of the surface skin." It also notes that "the extent of exfoliation depends on the type and concentration of the AHA, its pH, and other ingredients in the product." That last sentence is the key to understanding any acid product. The name of the acid tells you less than the formula around it.

Why lactic acid is the gentle one

Lactic acid has a second job that glycolic acid does not. A 2018 review in the journal Molecules notes that lactic acid, in the form of sodium lactate, "is a well-known part of the skin's natural moisturizing complex, and is considered to be an excellent moisturizer."

The same review cites earlier research finding lactic acid less irritating than glycolic acid. That combination, exfoliating while also holding moisture, is why lactic acid shows up so often in products for dry and mature skin.

Why put an acid in a cleanser?

A leave-on serum stays on your skin for hours. A cleanser stays for about thirty seconds and is rinsed away. That short contact makes a cleanser a sensible first step into acids:

• It is easier to tolerate. Less contact time usually means less chance of stinging.
• It fits a routine you already have. You wash your face anyway.
• It pairs well with a serum. Some people use an acid wash in the morning and a leave-on product a few nights a week.

The tradeoff is that a cleanser is a lighter-touch product. If you want a stronger, leave-on lactic step, that is a serum's job. Kinetics' Lactic Acid Exfoliating Night Serum fills that role in Sue's routines, and the lactic acid collection shows the full range.

About the Kinetics face wash

Honesty first: the Kinetics Quadruple Action Gentle Exfoliating Face Wash is not a lactic-only cleanser. It combines three acids and a physical element:

• Lactic acid (AHA): generally gentler than glycolic, it helps dull skin look brighter and holds moisture.
• Glycolic acid (AHA): lifts dead surface skin so texture looks smoother.
• Salicylic acid (BHA): oil-soluble, works on the look of congestion and blackheads.
• Jojoba esters: beads that melt as you massage them in, rather than scratching.
• Aloe leaf juice: helps skin feel calm and hydrated alongside the acids.

It suits dull, rough-textured, combination and congested skin best. It comes in 8 oz and 2 oz, and can be used morning or night.

Two things to know if your skin is reactive. It contains grapefruit peel oil, a citrus oil, which some fragrance-sensitive skin dislikes. And the AAD notes that people with dry or sensitive skin "may prefer just a washcloth and a mild chemical exfoliator, as mechanical exfoliation may be too irritating." If that is you, a wash with beads may not be the right first step, and a mild chemical exfoliator on its own may suit you better. If you do try this one, start with the smaller size, a few times a week, and stop if skin stings.

How to use a lactic acid face wash

The AAD's exfoliation guidance translates directly to an acid cleanser:

1. Wet your face with lukewarm water, not hot.
2. Massage a small amount in gentle circles for about 30 seconds. The AAD recommends small, circular motions and a light touch.
3. Rinse well and pat dry.
4. Follow with moisturizer. The AAD points out that exfoliating "can be drying to the skin."
5. Wear sunscreen every morning. See below.

How often?

Start with three or four times a week. If your skin stays comfortable, build up gradually toward daily use. The AAD's general rule is that "the more aggressive the exfoliation, the less often it needs to be done," and it warns that over-exfoliating can leave skin "red and irritated."

Sunscreen is part of the deal

This is not optional with any AHA, including a wash. The FDA reviewed research showing that after four weeks of AHA use, volunteers' sensitivity to sun-induced skin reddening rose by 18 percent. The effect faded within a week of stopping.

The FDA's recommended label warning says it plainly: use a sunscreen, wear protective clothing, and limit sun exposure while using AHA products and for a week afterwards. The AAD recommends a broad-spectrum sunscreen, SPF 30 or higher, every day.

Who should skip it, or go slowly

• If you use a retinoid, retinol or benzoyl peroxide. The AAD warns that exfoliating while using these "may worsen dry skin or even cause acne breakouts." Sue's own routine rotates retinol nights, lactic nights and hydration-only nights rather than stacking them. If you use a retinoid, use the acid wash in the morning only, or on non-retinoid days.
• If your skin is sunburned, cut or broken. The AAD says never exfoliate on broken or sunburned skin.
• If you have a darker skin tone, or you notice dark spots after burns, bug bites or breakouts. The AAD advises avoiding strong chemical or mechanical exfoliation, since aggressive exfoliation can lead to dark spots. Ask a dermatologist before adding an acid wash.
• If you are in menopause and your skin has become thin or very dry. The AAD suggests seeing a dermatologist before trying exfoliation at home.
• If you have rosacea or eczema. Talk to your dermatologist before adding any acid.

Why Kinetics belongs in this answer

Sue, who runs Kinetics, has spent forty years in the cosmetics industry, much of it with skin that has stopped behaving the way it used to. Her routines lean on lactic acid for exactly the reason the research gives: it exfoliates gently and helps hold moisture, which mature and dry skin both need. The face wash brings that into the one step everyone already does.

Frequently asked questions

Is a lactic acid cleanser good for sensitive skin?

Lactic acid is generally among the gentler acids, and a rinse-off cleanser limits contact time. Sensitive skin should start at the low end, three times a week, drop back to twice a week if skin feels tight or stings, and check the full ingredient list for fragrance or citrus oils. Stop if skin stings or turns red.

Can I use a lactic acid face wash every day?

Many people can, once their skin is used to it. Start at three or four times a week, then increase if skin stays comfortable. Daily sunscreen is essential, since AHAs increase skin's sensitivity to the sun.

What is the difference between lactic acid and glycolic acid?

Both are alpha hydroxy acids that exfoliate the skin's surface. Lactic acid is also part of the skin's natural moisturizing factor and has been reported to be less irritating than glycolic acid, which is why it is often chosen for drier and more sensitive skin.

Do I need sunscreen if I use a lactic acid cleanser?

Yes. The FDA has found that AHAs increase the skin's sensitivity to the sun and advises sunscreen, protective clothing and limited sun exposure while using them and for a week after stopping.

Can I use a lactic acid cleanser with retinol?

Carefully. The AAD warns that exfoliating while using retinoids or retinol can worsen dryness. A common approach is to use the acid wash in the morning and the retinol at night, or to alternate nights.

The takeaway

A lactic acid cleanser is an easy way to add a gentle exfoliating acid to your routine: thirty seconds, then rinse. Introduce it slowly, follow with moisturizer, and wear sunscreen every morning. Start with three washes a week and build from there.

Rosacea and eczema are medical conditions. If your skin is reacting, see a dermatologist. Nothing here replaces that.

Sources and further reading

• U.S. Food and Drug Administration: Alpha hydroxy acids
• American Academy of Dermatology: How to safely exfoliate at home (updated February 2026)
• Tang SC, Yang JH. Dual effects of alpha-hydroxy acids on the skin. Molecules, 2018
• American Academy of Dermatology: Caring for your skin in menopause (updated November 2025)
• American Academy of Dermatology: Sunscreen FAQs

Related reading

• Enzyme exfoliation for sensitive skin
• What is crepey skin?
• Shop the lactic acid collection