What Is PHA? Benefits, How to Use It & PHA vs AHA/BHA

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PHA is a group of chemical exfoliating acids that gently help remove dead skin cells from the surface of the skin.

Like AHA, it is mainly used to improve skin texture. However, PHA generally has a larger molecular structure and tends to work more gently on the skin. It also offers exfoliation with hydration support, which sets it apart from many other exfoliating acids.

PHA can be a good option for people who find stronger exfoliating acids too harsh or simply want gentler exfoliation.

What Is PHA?

PHA stands for Polyhydroxy Acid.

PHA is not the name of one specific ingredient. It refers to a group of acids. Common examples include Gluconolactone and Lactobionic Acid.

This means that even if a product says PHA on the front label, you may find an ingredient such as Gluconolactone or Lactobionic Acid in the full ingredient list.

What Are the Benefits of PHA?

Gentle Exfoliation

PHA helps remove dead skin cells from the surface of the skin, which can help smooth rough texture and improve dull-looking skin.

Because PHA generally acts more gently than common AHAs, it is often used in exfoliating products designed with sensitive skin in mind. However, this does not mean PHA is completely irritation-free.

Hydration Support

PHA does more than exfoliate. It also has properties that help attract and retain moisture.

Research suggests that PHAs can provide additional moisturizing benefits and help support skin hydration and barrier function.

PHA ingredients have also shown antioxidant properties, although their main role in everyday skincare is gentle exfoliation and hydration support.

PHA vs AHA vs BHA

All three are used for chemical exfoliation, but they have different characteristics and are often chosen for different skin concerns.

PHA AHA BHA
Common example Gluconolactone Glycolic Acid, Lactic Acid Salicylic Acid
Main target Skin surface Skin surface Oil and pores
Often used for Gentle exfoliation + hydration Texture + dullness Oil + blackheads

If rough texture and dullness are your main concerns, AHA may be a better fit. If you are more concerned about oil and blackheads, BHA may be more useful. PHA is worth considering when you want gentler surface exfoliation.

Why Are AHA, BHA and PHA Used Together?

Some skincare products combine AHA + BHA + PHA in one formula.

For example, a product may contain an AHA along with Salicylic Acid (BHA) and Gluconolactone or Lactobionic Acid (PHA).

The idea is to bring the different properties of these acids into one formula. Together, they can target different aspects of exfoliation, from surface texture to excess oil and clogged pores.

However, PHA does not cancel out the potential irritation from AHA or BHA. Seeing AHA, BHA and PHA on the same product also does not mean that all three acids are used at the same concentration or at high concentrations.

How strong a product feels depends on the type and concentration of the acids, the pH, and the overall formula.

How to Use PHA

PHA can be found in toners, toner pads, serums, cleansers and other exfoliating products.

If you are new to PHA, start by using it less often rather than every day. You can then adjust the frequency based on how your skin responds.

If you already use other exfoliating acids such as AHA or BHA, avoid automatically layering several exfoliating products at once.

If your skin becomes unusually dry, red or irritated, reduce how often you use the product or stop using it for a while.

If your product also contains AHA, sun protection is especially important. The U.S. FDA notes that AHA products may increase skin sensitivity to the sun.

🇰🇷 Local Note

In Korean skincare, you may see AHA, BHA and PHA combined in toners, toner pads and cleansers.

Having several types of acids in one product does not necessarily mean that all three are used at high concentrations. Some products combine different acids in different amounts for light exfoliation and everyday texture care.

If you have a specific skin concern, it can be more useful to look at which acid is the main focus of the product.

For oil and blackheads, look for products centered around BHA. For rough texture and dullness, AHA may be more relevant. If you want gentler exfoliation, PHA may be worth considering.

FAQ

Can You Use PHA Every Day?

Some PHA products are formulated for daily use, but that does not mean everyone needs to use PHA every day.

If you are new to it, start less frequently and increase use only if your skin tolerates it well.

Can You Use PHA With AHA or BHA?

Yes. Some products already combine AHA, BHA and PHA in a single formula.

However, if you are using separate exfoliating products, be careful about layering them too often, as this may increase irritation.

Is PHA Good for Blackheads?

PHA can help exfoliate the surface of the skin, but if oil and blackheads are your main concerns, BHA is generally the more targeted choice.

Sources

  • PubMed / Dermatologic Surgery — PHA exfoliation, hydration, skin tolerability and antioxidant properties
  • Journal of Drugs in Dermatology — Characteristics and common uses of AHA, BHA and PHA
  • U.S. FDA — AHA skincare products and sun sensitivity

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