Exfoliation is one of the fastest ways to transform dull, uneven skin into a radiant glow. But not all exfoliants are created equal—and when it comes to gentle yet effective resurfacing, lactic acid has become a dermatologist favorite.

So, is lactic acid the secret to smoother, younger-looking skin or could it backfire for sensitive users? Let’s dive into the science, benefits, risks, and how SkinBuddy helps you find lactic acid products that perfectly match your skin concerns.

What Is Lactic Acid?

Lactic acid is an alpha hydroxy acid (AHA) naturally found in milk and produced in the body during exercise. In skincare, it’s synthetically produced and widely used for its exfoliating and hydrating properties.

Unlike glycolic acid, lactic acid has a larger molecular size, which means it penetrates more slowly into the skin making it less irritating and more suitable for sensitive skin types.

According to a 2024 review in Biomedicines, lactic acid is considered one of the safest and most versatile AHAs, offering benefits beyond exfoliation, such as boosting hydration and improving barrier function.

The Science of Lactic Acid in Skincare

1. Exfoliation

Lactic acid works by breaking down the bonds between dead skin cells, allowing them to shed more easily. This reveals smoother, brighter skin beneath.

2. Hydration

Unlike other exfoliating acids, lactic acid is also a humectant - it attracts water to the skin, improving hydration.

3. Anti-Aging

A classic study published in the Journal of the American Academy of Dermatology showed that lactic acid stimulates collagen renewal, reduces fine lines, and improves overall skin texture with consistent use.

4. Barrier Support

Newer research highlights lactic acid’s ability to strengthen the skin barrier and regulate the skin’s microbiome, making it an important tool for maintaining healthy skin long-term.

Benefits of Lactic Acid

• Brightens Dull Skin – Speeds up cell turnover, leaving skin more radiant.
• Evens Tone & Fades Spots – Helps reduce post-acne marks and hyperpigmentation.
• Smooths Texture – Refines rough patches and softens fine lines.
• Hydrates & Plumps – Attracts moisture, unlike harsher exfoliants.
• Gentle Yet Effective – Suitable for beginners and sensitive skin when used in low concentrations.

Potential Risks and Downsides

While lactic acid is gentler than glycolic acid, it’s still an active exfoliant and that comes with risks:

• Irritation & Stinging: Overuse or high concentrations can trigger redness and burning.

• Sun Sensitivity: Like all AHAs, lactic acid increases your skin’s sensitivity to UV rays. Daily SPF is non-negotiable.

• Barrier Damage: Using it too often can compromise the skin barrier, especially in sensitive or dry skin types.

Who Should Use Lactic Acid?

• Beginners to chemical exfoliants
• Sensitive skin types (when used at lower concentrations)
• Aging skin looking to improve elasticity and reduce wrinkles
• Dry or dehydrated skin needing hydration plus exfoliation

Not ideal for:

• Skin with active eczema or rosacea flare-ups

• Those using multiple strong actives (retinoids, benzoyl peroxide) without proper guidance

How to Use Lactic Acid Safely

• Start Low: Begin with 5% lactic acid and build tolerance.

• Frequency: Use 1–2 times per week initially, then increase if tolerated.

• Layer Wisely: Avoid combining with other strong exfoliants or retinoids in the same routine.

• Moisturize: Always follow with a nourishing cream to support the barrier.

• SPF Daily: Essential to prevent sun damage and worsening pigmentation.

How SkinBuddy Helps You Find Lactic Acid Products That Fit Your Concerns

Not all lactic acid products are equal - some are formulated with soothing ingredients like hyaluronic acid, while others may be combined with harsh actives that can irritate sensitive skin.

SkinBuddy makes it simple to find what works for YOU:

• Open Discover Ideal Match in the app
• Select Lactic Acid as your key ingredient
• Add filters like Non-Irritating, Fragrance-Free, or Hydrating
• Instantly see personalized recommendations that balance exfoliation with barrier care
• Tap any product to view ingredient analysis, comedogenicity or irritancy levels, and detailed explanations of how it impacts your skin

Try SkinBuddy to find out what works for your skin, and what doesn’t.

Scan your skincare, avoid pore-clogging or irritating ingredients, and discover smarter product matches. Open the web app or download the mobile app to get started.

Open SkinBuddy Web App

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Check if your skincare suits your skin type, sensitivity, or acne-prone needs at skinbuddy.app and discover better options that match your routine and goals. SkinBuddy makes it easy, fast, and science-backed.

Scan to get started:

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App Store & Google Play

FAQs About Lactic Acid in Skincare

1. Can I use lactic acid every day?

   Not at first. Start 1–2 times weekly and increase as tolerated.

2. Is lactic acid safe for sensitive skin?

   Yes, it’s one of the gentlest AHAs, but always start with lower strengths.

3. Can I combine lactic acid with retinol?

   It’s best to alternate nights to reduce irritation risk.

4. How long until I see results?

   Most people notice smoother, brighter skin in 2–4 weeks with consistent use.

5. Is lactic acid pregnancy-safe?

   Yes, unlike retinoids, lactic acid is generally considered safe during pregnancy.

Final Thoughts

Lactic acid is more than just an exfoliant - it’s a hydrating, barrier-supporting, collagen-boosting powerhouse. Whether you’re a beginner looking for your first acid or a sensitive skin type needing something gentler than glycolic acid, lactic acid deserves a spot in your routine.

With SkinBuddy, you don’t need to guess which lactic acid product is right for you. Our ingredient analysis and smart filters help you find the perfect formula that matches ALL your skin concerns, so you can achieve glowing skin without irritation.

👉 Ready to find your glow?

Download the SkinBuddy app and discover lactic acid products that work for your skin, backed by science.