Can You Use Glycolic and Lactic Acid Together?

by: Linda Robison

I’ve always been a fan of acids, especially for aging skin. Using glycolic and lactic acid together is one of my favorite strategies because they help exfoliate, smooth, and brighten the skin.

A woman applying glycolic acid and lactic acids.

Each acid has its strengths, and when combined in a routine—if done right—they can give you that extra boost for a radiant complexion. Best of all, they’re inexpensive!

Understanding: Basics of glycolic and lactic acids

Both alpha hydroxy acids (AHAs) work wonders for resurfacing the skin, but they each bring something different to the table. And their effectiveness relies on concentration and pH levels. Higher concentrations and lower pH offer stronger exfoliation but may irritate sensitive skin.

Glycolic Acid:

  • Derived from sugar cane, glycolic acid has the smallest molecules among AHAs, allowing for deep penetration and effective exfoliation. It improves skin tone, texture, and overall appearance by reducing fine lines, wrinkles, hyperpigmentation, and acne scars.

Lactic Acid:

  • Lactic acid is a gentler AHA with larger molecules, making it suitable for sensitive or dry skin. It exfoliates and hydrates more gently than glycolic acid, effectively improving skin texture and tone with minimal irritation.

Is it safe to use glycolic and lactic acids together?

Yes, but it's important to choose the right products. Low-concentration cleansers, serums and toners can be used together without issues, but avoid using peels on the same day. To prevent irritation, alternate the use of stronger products. Both acids can complement each when use carefully.

Note: See my sample routine below!

Choosing Products: Serums, Toners, and Peels

Collection of glycolic and lactic acid skincare products, including serums, toners, and creams, ideal for radiant skin and gentle exfoliation.

When it comes to using AHA's, the right product choice makes all the difference. Here’s a quick rundown of the types of products you can use:

1. Cleansers

AHA cleansers, with glycolic or lactic acid, gently exfoliate while washing away dirt and makeup. They're perfect for daily use as they help maintain smoother skin without being too harsh.

2. Toners
Toners help prep your skin for the next steps. Opt for an exfoliating toner that contains one of these acids. Use it after cleansing.

3. Serums
Serums are concentrated formulas that deliver potent ingredients directly into your skin. Look for glycolic or lactic acid serums with a balanced pH to maximize benefits. They’re great for targeted treatment. 

4. Peels
Peels offer a more intense experience, providing deeper exfoliation. You can find both glycolic and lactic acid peels in various strengths. Use them as directed, typically once a week, for a noticeable glow.

Mixing and Matching
You can mix and match AHAs, but it’s important to balance strengths. Lower-dose products like cleansers and toners can usually be used together daily. For stronger treatments like peels or high-strength serums, alternate them on different days to avoid irritation. See my routine below ...

Step-by-Step Guide: Layering the acids

My Sample Routine:

It’s hard to give one-size-fits-all advice because there are so many different types and strengths out there. To help you understand how you might mix and match these acids, I wanted to share my personal routine.

Here’s how I incorporate a cleanser, toner, serum, and peel into my monthly routine:

Daily routine:

cleanser

1. Cleanser: I start each day with my favorite Garnier Micellar 1% glycolic acid cleanser.

2. Toner: After cleansing, I use The Ordinary Toner with 7% glycolic acid.

Both products are gentle enough for everyday use and work well with my skin.

Weekly routine:

peel

3. Serum: I use Theraderm Fruit Acid Exfoliate a few times a week. And since it’s gentle enough for use under the eyes, it helps minimize fine lines and wrinkles.

4. Peel: I apply SkinBeauty Lactic Acid 35% peel every 7-10 days. Although it’s effective, it can irritate if left on too long. If you’re new to acids, start with a lower concentration and always follow the directions.

Monthly routine:

q

5. Peel: I use the iS Clinical Active Peel Treatment System once a month or before a special occasion.

I ADORE this product! The directions say to use every other day, but my skin feels too dry if I use it that often. Plus, it's expensive!

This peel system really makes your skin look like glass! It contains AHAs and a small amount of beta hydroxy acid (BHA) in the form of salicylic acid. Most people associate BHA's with oily skin or acne. 

Salicylic acid is found in products like iS Clinical Active Peel because it soothes the skin and boosts the effectiveness of glycolic and lactic acids. this makes it beneficial for aging or non-oily skin by improving texture and reducing irritation.

Guidelines for general usage based on percentage:

Lactic acid and glycolic acid share similar general guidelines for usage based on their concentrations, though glycolic acid tends to be stronger due to its smaller molecular size, allowing it to penetrate the skin more deeply.

Here’s a breakdown for both acids. But always remember to follow product recommendations.

Lactic Acid

  • Low concentrations (5%-10%): Safe for frequent use, even daily or every other day if your skin tolerates it. Common in toners, serums, and mild peels for gentle exfoliation and hydration.
  • Moderate concentrations (10%-20%): Best used 2-3 times a week, offering deeper exfoliation without overwhelming the skin.
  • High concentrations (20%-30%): Found in more intense at-home peels. Use no more than once a week, depending on your skin's sensitivity.
  • Professional-grade (35% and above): Reserved for professional treatments. Strong enough to require application by a trained professional to avoid burns or irritation.

Glycolic Acid

  • Low concentrations (up to 10%): Similar to lactic acid, safe for frequent use every other day or even daily, depending on tolerance. Often found in over-the-counter products.
  • Moderate concentrations (10%-20%): Recommended for use 2-3 times a week, providing deeper exfoliation to tackle concerns like uneven texture or hyperpigmentation.
  • High concentrations (20%-30%): Typically used for stronger at-home peels, with caution. Limit to once a week.
  • Professional-grade (35% and above): Applied by professionals only. These peels are stronger, requiring careful monitoring to avoid skin damage.

Both acids can enhance your skincare routine, but glycolic acid tends to be more intense. For those using both, spacing out applications.

How often should you use them?

A woman using different skincare products at different times of the day.

Ease Into It

Start with gentle cleansers, toners, and serums. Then, add a peel once a month. As your skin adjusts and shows tolerance, you can gradually increase the frequency to a few times a month.

Introducing Them to Your Routine

For those with sensitive skin, start with mild lactic acid peel. After a few weeks, you can alternate with a glycolic peel on different weeks. 

Which One Goes First?

If you don't have very sensitive skin, start with glycolic peel. Its smaller molecules allow for deeper exfoliation. Use lactic acid on separate days for hydration and gentle renewal. Never use two separate peels together unless they're formulated within a product.

What If You Use Retinol?
If you do, avoid using it on the same you use peels. Low concentration cleansers and toners should be fine. Always pay attention to your complexion! Redness or irritation is a sign it's too much for your skin type!

Don't forget to moisturize!

Importance of Hydration

After using acids, it’s crucial to moisturize. These products can dry out your skin, so keep it hydrated with a moisturizer that has ingredients like hyaluronic acid or ceramides to strengthen the skin barrier.

Sunscreen is a must!

Since acids make your skin more sensitive to the sun, daily sunscreen is essential to protect against sun damage. Choose SPF 30 or higher to keep your skin safe and prevent signs of aging.

Signs of over-exfoliation and how to fix it

Irritation, redness, or flakiness are signs of over-exfoliation. This indicates inflammation, which can actually age your skin over time. If this happens, stop using acids and focus on calming, hydrating products.

How to Soothe Irritated Skin
Use rich calming creams with ceramides and omega 3 fatty acids. Skip ALL exfoliation until your skin feels balanced again.



Question: Can I use glycolic acid and retinol together?

Answer: While glycolic acid helps remove dead skin cells, and retinol boosts skin cell turnover, dermatologists recommend alternating their use due to the potential for irritation when used simultaneously. If you have sensitive skin, it's best to consult your dermatologist before combining these ingredients.

Question: Can I use both in one routine?

Answer: Only in specially formulated products; otherwise, alternate.

Question: What if I use retinol?

Answer: Avoid using retinol and glycolic acid on the same night. Alternate them.

Question: Can I use them with vitamin C?

Answer: Yes but use vitamin C at different times. This shouldn't be a problem since you would use vitamin C everyday and the acids only on certain days of the week/month. On the days you use the acids, skip the vitamin C.

Takeaway:

Layering these exfoliating acids can help brighten and smooth your skin when used correctly. Analyze your skin to determine if you need a deeper exfoliation treatment; if it looks really dull or flaky, reach for glycolic acid. If it’s just a little dull, a lactic acid refresh might be all it needs.

Just remember to alternate their use, keep your skin moisturized, and wear sunscreen every day. With these simple steps, you can enjoy a fresh, youthful look at any age without breaking the bank. It’s an easy and affordable way to enhance your skincare routine!


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