Glycolic Acid vs. Lactic Acid: The Key Differences for Aging Skin

by: Linda Robison

Glycolic Acid vs. Lactic Acid: If you're after radiant, smooth, poreless skin, consider adding glycolic and lactic acid to your skincare routine.

But what exactly are their benefits, and how do they compare?

Glycolic Acid vs. Lactic Acid benefits.

Why you need glycolic and lactic acids?

Aging, dry skin, and sun damage can slow down your skin’s natural shedding process. This leads to a buildup of dead cells.

When that happens, you may notice lines and wrinkles more because those dead cells can settle into them, making everything look dull and rough.

That’s where glycolic and lactic acids come into play.

Both are alpha hydroxy acids (AHAs) that act as natural exfoliants. They break down the bonds between dead skin cells. This helps your skin shed more quickly, revealing a smoother, brighter complexion.

While some AHAs are natural, many skincare products use synthetic versions for better consistency and lower costs.

Side Note: AHAs can be derived from various sources, including fruits, milk, and sugarcane. For a natural option, check out the Anti-Aging Sugar Scrub Page!

Glycolic Acid vs. Lactic Acid: The Key Differences

While both glycolic and lactic acid offer great exfoliation, they differ in their strength and the skin types they are best suited for. Here’s a quick breakdown of how they compare:

Chart comparing glycolic acid and lactic acid benefits.

Glycolic Acid: The powerhouse AHA

What It Is:

Glycolic acid is the smallest AHA molecule. Because of its small size, it can penetrate deeply making it one of the most potent exfoliants in the AHA family. It's a go-to for those looking to address fine lines, wrinkles, and hyperpigmentation.

Key Benefits:

  • Deep exfoliation: Sheds dead skin cells and promotes cell turnover.
  • Stimulates collagen production: Boosts collagen in deeper skin layers, reducing fine lines and wrinkles.
  • Improves skin texture: Smooths rough patches and evens skin tone, minimizing hyperpigmentation, acne scars, and sun damage.

Who Is it Best For?

Great for normal to oily skin. As a strong exfoliant, it's the perfect choice for those seeking powerful results.

Lactic Acid: The Gentle Giant

What It Is:

Lactic acid, on the other hand, is a milder AHA. Because its molecules are larger, it doesn’t penetrate the skin as deeply as glycolic acid, making it a gentler option for exfoliation.

Despite being less intense, it's still highly effective at improving skin hydration and smoothing out fine lines.

Key Benefits:

  • Gentle exfoliation: Ideal for sensitive skin and beginners, shedding dead skin cells without irritation.
  • Boosts moisture: Attracts moisture to the skin, enhancing hydration.
  • Brightens and smooths: Lightens dark spots and smooths fine lines, though results are slower than glycolic acid.

Who Is it Best For?

Sensitive, dry, or dehydrated skin. It’s a great starting point for newcomers to exfoliating acids, providing a milder option before advancing to stronger treatments like glycolic acid.

How to choose the right acid for you

Woman enjoying smooth firm skin after using AHA's.

Glycolic Acid: Best for oily, combination, or sun-damaged skin, this acid offers deep exfoliation and quick results. Its small molecular size allows for effective penetration, revealing brighter skin underneath.

Lactic Acid: Ideal for sensitive or dry skin, lactic acid provides a gentler exfoliation while boosting hydration. Its larger molecules offer a milder approach, making it a great starting point for beginners.

Considerations: When selecting an acid, think about your specific skin type and concerns. If you're unsure, consulting with a dermatologist can help you find the best fit for your needs.

Note: I've always loved lactic acid! It exfoliates well and keeps my skin hydrated, which is perfect for my dry skin. It’s my go-to acid. However, I still use glycolic acid occasionally when I want a deeper exfoliation, as it also helps my skin look firmer.

You don't have to pick just one!

You don’t have to choose just one! But avoid using glycolic and lactic acid peels on the same day.

Instead, alternate them with a few days or weeks in between. This way, you get the deep exfoliation of glycolic acid and the hydration boost from lactic acid without over-exfoliating.

Rotating between the two, especially for aging skin, keeps your complexion balanced. See how you Use Glycolic and Lactic Acid Together.

My experience:

In my dry skin routine, I regularly use lactic acid. It keeps my skin hydrated and exfoliates effectively. About once a month, I’ll add a glycolic acid peel. It gives my complexion a gorgeous glass-like sheen and added luminosity. Plus, it makes my skin feel firmer.

Glycolic acid is fantastic for boosting collagen production and improving texture. These benefits help maintain that firm look over time.

Keep in mind that results can vary. It’s essential to monitor how your skin responds. Listen to your skin and find what works best for you. If you’re new to AHAs, start with this rotation to minimize the risk of over-exfoliation.

Always follow up with a hydrating serum and sunscreen during the day. AHAs can make your skin more sensitive to sunlight.

Precaution

  • Never use glycolic acid and lactic acids at the same time, unless they're already combined within a specially formulate product.
  • Check with your dermatologist if you have issues like rosacea or acne.
  • Avoid using multiple products containing these acid at the same time.
  • Avoid using right after exfoliating treatments like scrubs, masks, microdermabrasion or laser treatments.
  • Stop using the acids when spending extended time at the beach or under direct sun.
  • Before mixing glycolic acid with other acne treatments or cosmetics, check with your dermatologist.
  • Always use sunscreen when applying glycolic & lactic acid products.
  • If you're pregnant, trying to conceive, or breastfeeding, consult your healthcare provider.

Final takeaway:

The Bottom Line:

Both glycolic and lactic acid are amazing options for getting smoother, more radiant skin. While glycolic acid packs a powerful exfoliating punch, lactic acid is a gentle option that’s great for more sensitive skin.

Depending on your skin type and needs, you can choose one or even combine both in your routine.

Just remember: Start slow, hydrate well, and always use sunscreen, as AHAs can make your skin more sensitive to the sun.


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