What are Polyhydroxy Acids (PHAs) in Skincare?

August 25, 2026

By: Lauren Sindel

Polyhydroxy acids (PHAs) are gentle chemical exfoliants that offer a wide range of skincare benefits.

As much as we still adore AHAs, polyhydroxy acids tend to be better for sensitive skin thanks to their larger molecular structure. Meaning, they don’t penetrate as deeply and are less likely to leave your skin feeling irritated. 

That said, they can be combined with other acids for enhanced exfoliating benefits. Ahead, we show you exactly how they work, the skincare benefits of PHAs, and recommended products containing this super gentle acid.

What is a Polyhydroxy Acid?

Polyhydroxy acids (PHAs) are chemical exfoliants. Like alpha hydroxy acids, they’re a group of acids that exfoliate dead skin cells on the skin’s surface.

The most common types of polyhydroxy acids are gluconolactone, galactose, and lactobionic acid. You’ll find these common PHAs in everything from cleansers to serums and moisturizers. 

Gluconolactone is valued for its gentle exfoliating and antioxidant properties, while lactobionic acid is especially well known for its humectant and moisturizing properties.

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How are PHAs Different From AHAs and BHAs?

PHAs and AHAs are both exfoliating acids. The difference lies in their molecular structure. PHAs have a larger molecular structure which means they don’t penetrate as deeply as AHAs and BHAs. Instead, they work exclusively on the skin’s surface, helping to improve skin tone and texture. This also means PHAs offer less irritation and that skin does not become more photo sensitive with the use of these acids.

PHAs are Particularly Good at Improving Skin Texture

The most popular type of PHA used in products is Gluconolactone. It does three things for your skin. First, it removes dead cells on the skin’s surface which smooths rough texture, clears clogged pores, and gives skin a more refined appearance. Second, it supports collagen production, meaning it gives your skin a more youthful appearance. And third, it behaves as a humectant, drawing moisture into the skin for long-lasting hydration. 

Ultimately, PHAs exfoliate, hydrate, and combat loss of collagen. In doing so, they can help improve skin tone and texture for a smoother, more even appearance. From keratosis pilaris to dark spots, fine lines, and rough skin texture, PHAs can be an effective ingredient for treating these skin concerns. 

Polyhydroxy Acids are a Good Alternative for Sensitive Skin

Thanks to their larger molecule size, PHAs are ideal for all skin types, especially those prone to sensitivity. If you’ve used an AHA or BHA product in the past that’s irritated your skin, using a product with PHA could be a good alternative. This way, you get the exfoliating benefits while lowering the risk of skin irritation.

Next to this, their humectant properties make them an appealing option for people with dry skin. By attracting water into the skin, PHAs help to keep skin hydrated. So they essentially exfoliate without drying out your skin. 

Using PHA and AHA Together

Many products contain both AHA and PHA. That’s because they work well together and provide combined benefits. Polyhydroxy acids exfoliate gently and slowly while adding moisture to the skin. Alpha hydroxy acids like lactic and glycolic acid resurface the top layer of skin and boost cell turnover. PHA can actually buffer AHA, reducing potential irritation.

If you have very sensitive skin, it’s always best to speak to your doctor before using a new product. It could be that you’ll benefit more from using PHA on its own. 

If you have mature, oily or acne-prone skin, pairing them can have its benefits. The combined exfoliation can help with a range of skin problems including discoloration, large pores, blemishes, strawberry legs, and uneven skin texture.

How to Use PHAs for Face

If you’re experiencing enlarged pores, blemishes, or rough skin on your face, Truly Strawberry Blossoms Resurfacing Face Pads can leave your complexion looking visibly clearer and smoother. 

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They’re formulated with 4% PHA and 5.5% AHA to deeply yet gently exfoliate and refine uneven skin. Infused with niacinamide to reduce pore size and support the skin barrier. If you have sensitive skin, patch test before using. 

In the evening, swipe a pad across your face and neck. Use 1-3 times per week for best results. 

How to Use PHAs for Body

For KP bumps, strawberry skin, and discoloration, Truly Strawberry Blossoms Body Scrub can help smooth your skin’s appearance without irritation. Formulated with PHA + lactic acid, it gently exfoliates and removes dead skin buildup for instantly softer skin.

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Massage into wet skin in the shower, then rinse thoroughly and follow up with a moisturizer. For best results, use 1-3 times per week. 

FAQ

Are PHAs Safe for All Skin Types?

PHAs are generally considered gentle exfoliants and can be suitable for many skin types, including sensitive and dry skin. However, no skincare ingredient is guaranteed to suit everyone. If you have highly sensitive or reactive skin, introduce PHA gradually and perform a patch test before regular use.

Can I Use PHA Every Day?

PHA can potentially be used daily if your skin tolerates it and the product is formulated for daily use. However, beginners should start with a few applications per week and gradually increase frequency. If you notice dryness, redness, or irritation, reduce how often you use PHA.

Can I Use PHA with Glycolic Acid?

PHA and glycolic acid can be used together, but combining exfoliating acids may increase the risk of dryness or irritation. If you are new to chemical exfoliation, it is usually better to introduce them slowly.

Is It Safe to Use PHA While Pregnant?

PHAs are generally considered gentle exfoliating ingredients, but pregnancy can make skin more sensitive and skincare recommendations may vary. If you are pregnant or breastfeeding, consult your doctor or dermatologist before adding a new PHA product to your routine, especially if it contains other active ingredients.

When Will I See Results from PHA?

You may notice smoother and softer-feeling skin after the first few uses of PHA, while visible improvements in texture and overall radiance can take several weeks of consistent use. Results vary depending on the PHA product, concentration, frequency of use, and individual skin type.

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