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 levels. Higher concentrations offer stronger exfoliation but may irritate sensitive skin, if you haven't built a tolerance first.

Glycolic Acid:

  • 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, most people can safely use glycolic and lactic acid serums, toners, and cleansers together. However, when it comes to peels, never mix them unless they are already combined in a special formula.

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 available:

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

Exfoliating toners remove dead skin cells, unclogs pores, and brightens your complexion for a smoother, more radiant look. 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 deliver the most dramatic results, providing deeper exfoliation. You can find peels in various strengths. Use them as directed, typically once a week or few times a month, for a noticeable glow. Buffered peels are gentler and more recommended for first time users.

Step-by-Step Guide: Layering the acids

My Products & 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:

cleanserThese are my products, which is why some are half-empty. 😉

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.

Note: Theraderm Fruit Acid has significantly increased in price! It's a fantastic product that can be used under the eyes, which is why I still buy it. However, if you're looking for a more affordable option, check out this serum from The Ordinary. It has great reviews and a good price, but keep in mind that it shouldn't be used around the eyes.

4. Peel: I use SkinBeauty Lactic Acid 35% peel about every 7-10 days. This is strong because of its unbuffered, high concentration. But my skin is used to it from years of use. If you're new to acids, start with a lower concentration or a buffered peel and follow the directions. The company recommends their Buffered Glycolic Acid first time users.

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 recommend using it every other day, but it makes my skin too dry at that frequency. 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.

How to get started

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

Ease Into It

For those new to AHAs, start with a gentle cleanser for a few weeks. Then, introduce a low concentration (like 10%) serum. If your skin tolerates that well, maybe add a buffered peel once a month, gradually increasing frequency as your skin adjusts.

Introducing AHAs to Your Routine

If active ingredients (like retinols, vitamin C, or niacinamide) are part of your skincare routine, it's best to skip them on the days you use a strong peel to prevent irritation. 

Note: These are general suggestions, but everyone’s skin is unique. Always listen to your complexion—redness or irritation means you're overdoing it for your skin type!

FYI: General usage based on percentage

Just a quick FYI: lactic acid and glycolic acid have similar usage guidelines based on their concentrations. Here’s a quick breakdown for both.

Lactic Acid

  • Low concentrations (5%-10%): Safe for 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.

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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