Lactic Acid + AHAs: Smart Skincare Layering Guide

Can I Use Lactic Acid and AHA Together? Here’s What You Should Know

If you’re a fan of skincare acids, you’ve likely come across lactic acid and wondered how it fits with other AHAs (Alpha Hydroxy Acids). Can they be used together? Should they be? Let’s break it down.

With so many active ingredients promising to improve texture, clear breakouts, and boost glow, it’s easy to overdo things. That’s why understanding how ingredients interact is key to healthy skin.

In this post, we’ll explore lactic acid, how it works, how it fits with other AHAs, and how to use it in a routine that works for you.

What Is Lactic Acid?

Lactic acid is one of the most well-known AHAs, used in skincare for its gentle exfoliating and hydrating properties.

Historically, it was discovered in sour milk by Carl Wilhelm Scheele in the 18th century and later developed for skincare by Boehringer Ingelheim.

Unlike stronger acids, lactic acid has a larger molecular structure. This makes it less likely to penetrate deep and cause irritation.

It’s considered gentler than glycolic acid, making it a great starter AHA for sensitive or dry skin types.

Here are some of the benefits of using lactic acid:

Fades fine lines and wrinkles by promoting skin cell turnover and collagen production.

Strengthens the skin barrier by drawing and locking moisture into the skin’s outer layer.

Unclogs pores and removes dead skin cells, bacteria, and oil from the skin’s surface.

Brightens dull skin and improves rough or uneven texture.

Fights breakouts by clearing debris and reducing the chance of clogged pores.

Safe for sensitive skin, thanks to its mild exfoliating action and hydrating properties.

What Are AHAs?

Alpha Hydroxy Acids (AHAs) are a group of water-soluble acids derived from sugary fruits and milk.

Common AHAs include glycolic acid, mandelic acid, citric acid, and lactic acid.

They work on the skin’s surface by breaking the bonds that hold dead skin cells together, making it easier to remove them.

This exfoliation encourages brighter, smoother skin and helps other skincare products absorb more effectively.

Each AHA differs in strength and penetration depth. Lactic acid, for example, is milder than glycolic acid.

Can You Use Lactic Acid with Other AHAs?

Yes, you can use lactic acid with other AHAs, but you need to do it carefully.

Using multiple acids increases the risk of irritation, especially if you have sensitive skin or are new to chemical exfoliation.

If you want to combine lactic acid with other AHAs like glycolic or mandelic acid, start slow.

Try these strategies:

Option 1: Use Different Acids at Different Times of Day

Apply lactic acid in the morning and use another AHA, such as glycolic acid, in the evening.

This gives your skin time to adjust and avoids layering too many actives at once.

Option 2: Wait Between Applications

If you want to use both acids in the same routine, apply one and wait 10 to 15 minutes before the next.

This allows the first acid to absorb and prevents overwhelming your skin.

Option 3: Alternate Days

Use lactic acid on one day and another AHA on the next. This helps reduce the risk of over-exfoliation and keeps your skin barrier healthy.

What Should Lactic Acid Not Be Mixed With?

There are certain ingredients that shouldn’t be used with lactic acid—or only with caution.

Avoid the following combinations unless guided by a skincare expert:

Retinol + Lactic Acid: Both increase skin turnover and sensitivity. Together, they may cause peeling or irritation.

Vitamin C + Lactic Acid: The pH levels of these ingredients conflict and may reduce effectiveness or cause sensitivity.

BHA + Lactic Acid (e.g., Salicylic Acid): These can be used together in small doses, but overuse may damage the skin barrier.

If you’re just starting out, it’s best to stick with one exfoliating acid at a time.

Always patch test new ingredients and introduce them slowly into your routine.

Can I Use Lactic Acid After an AHA or BHA Peel?

No, it’s not recommended to use lactic acid right after a chemical peel—especially professional peels with strong AHAs or BHAs.

Peels are already high-concentration exfoliants and leave your skin sensitive, vulnerable, and healing.

Adding more acids immediately after can lead to:

Severe dryness, Redness, Burning sensations, Compromised skin barrier

Instead, opt for calming and hydrating ingredients like:

Hyaluronic acid, Ceramides, Panthenol, Aloe vera

Wait at least 3 to 5 days after a peel before reintroducing lactic acid or other exfoliants.

Is It OK to Use Lactic Acid Daily?

Yes, you can use lactic acid daily, but with caution.

Low-strength lactic acid products, such as cleansers or toners, are usually safe for daily use.

Products with higher concentrations—like serums or exfoliating masks—should be used 2–3 times a week at first.

Using lactic acid too often may cause:

Redness, Flaking, Itching, Sensitivity, Over-exfoliation

Start with a low concentration (around 5%) and work your way up as your skin adjusts.

Always follow with a moisturizer and broad-spectrum SPF 30–50, especially during the day.

Does Lactic Acid Cause Acne?

It can, especially during the initial detox phase.

When first using lactic acid, you may experience a purging period. This occurs as the acid speeds up cell turnover.

As pores clear, buried impurities rise to the surface—causing breakouts before things get better.

This is a normal and temporary reaction, typically lasting 1–2 weeks.

However, if breakouts persist beyond this, you may be reacting to the product. In that case, stop use and consult a dermatologist.

For acne-prone skin, consider combining lactic acid with niacinamide or salicylic acid, but always introduce actives slowly.

How to Add Lactic Acid to Your Skincare Routine

Lactic acid is available in several forms, including:

Cleansers, Toners, Serums, Masks, Moisturizers

The best way to introduce it depends on your skin type and concerns.

For Beginners

Start with a lactic acid cleanser or toner used 2–3 times a week. These rinse-off products are gentler and easier to tolerate.

For Intermediate Users

Upgrade to a lactic acid serum once your skin shows no signs of irritation.

Apply it after cleansing and toning, then follow with a moisturizer and sunscreen in the morning.

For Advanced Users

Use lactic acid-based masks or peels weekly for a deeper exfoliation. These contain higher concentrations and deliver more noticeable results.

Pro Tip

Always apply your skincare from thinnest to thickest: cleanser → toner → serum → moisturizer → SPF.

This helps active ingredients like lactic acid penetrate properly and avoids layering problems.

When Should You Use Lactic Acid?

Use lactic acid when your skin feels:

Dull, Rough, Dehydrated, Uneven in tone, Prone to breakouts, Experiencing mild pigmentation

It’s especially useful during cooler months when skin becomes dry and flaky.

Apply it in the evening for best results, and avoid using it right after sun exposure or on freshly shaved skin.

Final Thoughts

Lactic acid is a versatile, gentle AHA that plays well with most skincare routines when used correctly.

Yes, you can combine it with other AHAs—but only after your skin builds tolerance. Start slow, space out applications, and pay attention to how your skin reacts.

Avoid using it after intense treatments like chemical peels and always pair it with hydration and SPF protection.

If you’re unsure whether lactic acid is right for you, or how to pair it with other acids like glycolic or salicylic, don’t hesitate to ask a skincare expert.

For more personalized help, skincare tips, and product recommendations, visit us on Instagram at @Procoal. Our experts are happy to chat in the DMs!

DQH Knowledge drop: In your 20s, your skin cell turnover decreases. (Cell turnover is a key component in keeping your skin youthful.) You know what else slows down? Your collagen production. Starting in your 20s, collagen decreases by about 1 percent per year. Should you want to prevent fine lines and wrinkles, start by eliminating behaviors that contribute to premature aging. “If it’s bad for you, it’s bad for your skin,” says dermatologist Michel Somenek. “Cigarette smoking reduces blood flow to the skin and causes premature wrinkling and a dull skin texture. Making the repeated pursed motion to inhale can also cause smoker’s lines. Alcohol and recreational drugs are toxins for the skin that damage its cellular structure and DNA,” Somenek tells us. “The faster you eliminate vices while you are young, the better chance your skin and body have to recuperate.” Also, adopting an anti-aging routine in your 20s is key. After all, the best offense is a good defense. We spoke to Somenek and experts Joshua Ross and Audrey Kunin to find out more. Keep reading for the best anti-aging products for your 20s, according to skincare professionals. Sunscreen “We all know that the sun is the number one cause of skin aging and starting the prevention in your 20s is very important,” Ross says. “The majority of your sun damage won’t start to appear until you’re in your 30s, so don’t wait until you see it surface or you’ll be behind the curve. Stay ahead of it with a good-quality zinc-based sunscreen worn daily.” Farmacy Green Defense Daily Mineral Sunscreen An invisible sunscreen with SPF 30, plus botanical extracts meant to protect skin with tons of antioxidants. Bonus: It’s clean and fine to use under makeup. Bareminerals Complexion Rescue™ Tinted Moisturizer Broad Spectrum SPF 30 Although we recommend you use your SPF and moisturizer separately, we also understand moments when you don’t have time or energy for that extra step. For those times, this bareMinerals moisturizer is a great thing to have on hand. Vitamin C Serum “A great introduction to anti-aging is to start with a vitamin C serum in your morning skincare routine,” Ross says. “It’s a powerful antioxidant that will neutralize free radicals and brighten the skin.” He adds that it’s a great way to counteract the effects of the sun’s harmful rays, which, as previously mentioned, are among the biggest causes of premature aging. Drunk Elephant C-Firma™ Vitamin C Day Serum The Drunk Elephant C-Firma is a lightweight serum that promises to give skin a glow by combining the brightening powers of vitamin C with ferulic acid, l-ascorbic acid, and vitamin E. The included sodium hyaluronate is meant to replace hydration loss, so you shouldn’t have to deal with any irritation. Sunday Riley C.E.O. Rapid Flash Brightening Serum This potent serum is jam-packed with vitamin C (15 percent, to be exact), which means it’s a potential superstar at both brightening skin and dousing it in antioxidants. Peptides Using peptides on your skin has many benefits, says Somenek. “The skin barrier is what defends the body against pollution, UV rays, bacteria, and toxins. It can be damaged by several everyday factors. Using topical peptides aids in building a stronger barrier,” he says. “Peptides comprise elastic fibers, which are a type of protein. These fibers help to make skin appear taut and firm. Peptides can also help repair damaged skin, relieve inflammation, and even out skin tone. Some peptides can kill acne-causing bacteria that is common in 20-somethings.” Kunin agrees, saying, “Peptides are an excellent entry point for supporting collagen.” She recommends looking for face and eye treatments that contain these collagen-boosting powerhouses. Charlotte Tilbury Magic Eye Rescue Cream This Charlotte Tilbury super-emollient eye cream has a base of coconut oil and shea butter (read: it’s incredibly hydrating). Botanicals plus peptides are meant to help reduce dark circles and boost collagen, respectively. This creamy moisturizer serves up potent collagen-boosting peptides and pycnogenol, and antioxidant-rich vitamin C. “Instead of sitting on top of the skin, peptides penetrate the outer layer so they go deep. The ‘signals’ they send tell the cells to produce elastin and collagen, which are needed for youthful-looking skin,” explains Somenek. At-Home Peel Pads Remember that skin cell turnover fiasco we talked about earlier? One way to help support it is by exfoliating. “Exfoliation is important to help keep skin fresh and luminous,” Kunin says. She recommends using at-home peel pads as an easy and effective way to exfoliate. “The goal in your 20s is to fight the slowing pace of cell turnover. It is wise to use products that gently exfoliate, yet still remove oil and other impurities. Products that have Alpha Hydroxy Acids (AHA) or Beta Hydroxy Acids (BHA) are a good choice.” According to Somenek, you should only exfoliate two to three times a week. “People of all ages are guilty of over-exfoliating and that can be too much of a good thing,” he says. Dermadoctor Kakadu C Intensive Vitamin C Peel Pad A few swipes of this Derma Doctor powerful peel pad promise to leave your skin glowing and smooth, thanks to the seven (yes, seven) types of chemical exfoliants, including AHA and BHA. It also contains vitamin C via Kakadu plum extract for added brightening and antioxidant protection. KEY INGREDIENTS Kakadu plum extract is sourced from the Kakadu plum, a fruit grown in northern Australia. It contains vitamin C, which restores the skin’s natural barrier, increases collagen production, and soothes irritation. Dr. Dennis Gross Skincare Alpha Beta® Universal Daily Peel Pads These are the gold standard of peel pads, with a cult following and over 900 five-star reviews on Sephora. They’re easy to use and contain a blend of anti-aging exfoliating acids. Emollient Night Cream “In your 20s, you need to start upping the hydration in your skincare routine. You may have been cautious of over-moisturizing because of acne in your teens, but as you enter your 20s, your skin transitions and becomes drier,” Ross says. “I recommend an emollient night cream added into your evening skincare regimen.” “Twenty-somethings need to make sure that they are not using creams that will clog their pores and cause excess oil production,” says Somenek. Opt for non-comedogenic products. Cerave Skin Renewing Night Cream One great choice is the CeraVe Skin Renewing Night Cream, which is a non-comedogenic night cream that leaves skin soft and glowy. It combines the moisturizing powers of ceramides and hyaluronic acid. RoC Retinol Correxion Max Hydration Creme “The best night cream ingredients contain retinol, benzoyl peroxide, and/or salicylic acid or hyaluronic acid. The goal is to moisturize, yet remove excess oil,” says Somenek. This Roc Retinol Correxion cream fits the bill as it contains both hyaluronic acid and retinol so it promises to moisturize while also being non-comedogenic.

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