If exfoliating acids like glycolic or salicylic have ever left your skin stinging or flaky, there’s a new hero ingredient you need to know about: PHA, or polyhydroxy acids.

These next-generation exfoliants deliver the glow-boosting, smoothing benefits of traditional acids but with far less irritation. In fact, PHAs are so gentle that even those with rosacea or compromised skin barriers can often use them safely.

So what makes PHAs different from AHAs and BHAs, and do they really deserve all the hype? Let’s break down the science behind PHAs, their benefits, and how SkinBuddy helps you find the right exfoliant for your skin type.

What Are PHAs?

PHAs (Polyhydroxy Acids) are a group of exfoliating acids chemically related to AHAs (Alpha Hydroxy Acids) but with larger molecular structures. This means they penetrate the skin more slowly, offering gentle exfoliation without irritation.

Common PHAs include:

• Gluconolactone

• Lactobionic Acid

• Galactose

According to a clinical review published in the Journal of Cosmetic Dermatology, PHAs provide comparable exfoliating and anti-aging benefits to AHAs but with less irritation, making them particularly suitable for sensitive, rosacea-prone, and post-procedure skin.

How PHAs Work

Like AHAs, PHAs dissolve the bonds between dead skin cells, encouraging them to shed naturally. The result?

✔ Smoother texture

✔ Brighter tone

✔ Improved moisture retention

But PHAs go beyond exfoliation. As highlighted by Chemist Confessions, PHAs such as gluconolactone act as powerful humectants, drawing water into the skin while gently refining the surface — a rare combination of hydration and exfoliation in one ingredient.

Benefits of PHAs in Skincare

1. Gentle Exfoliation for Sensitive Skin

Unlike glycolic or lactic acid, PHAs exfoliate slowly, minimizing stinging or redness. Perfect for those who’ve reacted to stronger acids in the past.

2. Strengthens the Skin Barrier

PHAs help increase skin hydration and reinforce the lipid barrier — ideal for dry, eczema-prone, or compromised skin.

3. Antioxidant Protection

Some PHAs, like gluconolactone, act as antioxidants, protecting the skin from environmental stressors and free radicals.

4. Anti-Aging Benefits

Regular use promotes cell turnover and improves the appearance of fine lines, uneven tone, and dullness.

5. Hydration Boost

Unlike other acids, PHAs attract and hold moisture, leaving skin plump and dewy — no dryness or peeling.

6. Compatible with Other Actives

PHAs can be used alongside retinol, niacinamide, and peptides without causing irritation, making them perfect for multi-active routines.

Who Should Use PHAs

Best for:

• Sensitive or reactive skin

• Rosacea-prone or eczema-prone skin

• Dry, flaky complexions

• Those new to exfoliating acids

Caution for:

• None in particular: PHAs are generally well-tolerated, even by those who cannot use AHAs or BHAs.

PHA vs. AHA vs. BHA

If your skin stings from glycolic acid or flakes from salicylic acid, PHAs offer the same glow — without the drama.

How to Use PHAs in Your Routine

1. Start Slowly – Use 2–3 times per week, increasing frequency as your skin adjusts.

2. Apply After Cleansing – Use a PHA toner, essence, or serum on clean, dry skin.

3. Moisturize Generously – Seal in hydration with a barrier-repair moisturizer.

4. Use SPF Daily – Even though PHAs are gentle, exfoliation always increases sun sensitivity.

5. Don’t Overlayer – Avoid combining multiple exfoliants in the same routine.

PHAs in Different Product Types

• Toners & Essences: For daily mild exfoliation.

• Serums: Combine PHAs with hydrating or anti-aging ingredients.

• Cleansers: Ideal for very sensitive skin — rinse-off contact reduces irritation risk.

• Peel Pads: Great for a weekly glow boost with controlled exfoliation.

Possible Side Effects

Although PHAs are considered non-irritating, mild tingling or slight redness can occur at first. Always patch-test new acids before full use.

How SkinBuddy Helps You Find the Perfect PHA Products

With so many exfoliants on the market, choosing the right one can feel overwhelming. That’s where SkinBuddy makes it effortless.

• In your Skin Profile, select “Sensitive Skin”, “Dry Skin”, or “Barrier Damage” as your main concern.
• When you scan any skincare product, SkinBuddy instantly identifies whether it contains PHA ingredients like gluconolactone or lactobionic acid.
• You’ll see a detailed explanation of how PHAs affect your skin — whether hydrating, exfoliating, or barrier-supportive.
• In Discover Ideal Match, select “Exfoliation” as your goal and filter by Non-Irritating or Barrier-Friendly products.
• Instantly browse PHA-based toners, serums, and masks tailored to your skin type.

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.

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Check Products Online

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:

Web App (mobile only)

App Store & Google Play

FAQs About PHAs in Skincare

1. Are PHAs safe for sensitive skin?

   Yes, they are the gentlest exfoliating acids available, even for rosacea-prone or post-procedure skin.

2. Can PHAs replace AHAs or BHAs?

   They can if your skin can’t tolerate stronger acids. PHAs provide similar smoothing and brightening effects over time.

3. Can I use PHAs daily?

   Most people can, especially in low concentrations. Start 3 times a week and increase gradually.

4. Do PHAs make skin more sun-sensitive?

   Slightly, yes. Always wear sunscreen daily when using any exfoliating acids.

5. Can I combine PHAs with retinol or Vitamin C?

   Yes, PHAs are mild enough to use alongside other actives without causing irritation.

Final Thoughts

PHAs are the perfect middle ground between exfoliation and hydration — ideal for anyone who’s struggled with harsh acids or sensitivity. They gently renew your skin while strengthening its barrier, giving you a smooth, luminous glow without redness or flaking.

With SkinBuddy, you can easily identify the right PHA products that match your goals — from smoother texture to improved hydration. Whether you’re new to exfoliation or have sensitive skin, SkinBuddy helps you build a skincare routine that works in harmony with your skin’s needs.

👉 Ready to discover your new exfoliating hero?

Download the SkinBuddy app and find personalized, PHA-powered skincare that delivers real results.