AHA, BHA, and PHA acids are among the most commonly used active ingredients in modern skincare. You’ll find them in serums, toners, exfoliating treatments, and cleansers, and they’re most often associated with exfoliation, or the removal of dead skin cells from the skin’s surface.
Although they’re often grouped together as “skincare acids,” they don’t all work the same way. Each type has different properties and may be better suited to specific skin types or skin concerns.
So, what’s the difference between AHA, BHA, and PHA acids? And how do you choose the right one?
Dead skin cells naturally build up on the surface of the skin. Exfoliation helps support this process and can contribute to a smoother, fresher-looking complexion.
Regular exfoliation is often associated with:
That said, more exfoliation does not automatically mean better results. Overusing acids can lead to irritation or a weakened skin barrier.
AHAs (Alpha Hydroxy Acids) are water-soluble acids that work primarily on the skin’s surface.
They’re often used to address:
Some of the best-known AHA acids include:
Each one has slightly different properties and levels of intensity.
Glycolic acid is one of the best-known AHA acids.
Because of its small molecular size, it can penetrate the skin more effectively, which is why it’s often considered one of the more intensive forms of chemical exfoliation.
It can work well for some skin types, but more sensitive skin may not always tolerate it as easily.
Lactic acid is generally considered a gentler AHA acid.
In addition to its exfoliating properties, it’s also associated with supporting hydration, which makes it a popular option for dry or more sensitive skin.
BHAs (Beta Hydroxy Acids) are oil-soluble, which allows them to work inside the pores as well as on the skin’s surface.
The best-known BHA is salicylic acid.
This ability to penetrate the pores explains why BHA is often associated with care for:
That’s why BHA acids are popular ingredients in routines for acne-prone or congested skin.
PHAs (Polyhydroxy Acids) are generally considered the gentlest group of exfoliating acids.
They have larger molecules, so they penetrate the skin more slowly and are often better tolerated by sensitive skin.
Common PHA acids include:
Their gentle nature is one of the main reasons they’ve become increasingly popular in Korean skincare.
Choosing the right acid depends mainly on your skin type and its needs.
In general:
However, everyone’s skin responds differently, so there is no universal solution that works for all.
Yes, but carefully.
Some products contain a combination of different acid types to target multiple skin concerns at once.
When introducing exfoliating acids into your routine, it’s best to start gradually and watch how your skin reacts.
Overly intense exfoliation can lead to sensitivity or a compromised skin barrier.
How often you use them depends on the product type, concentration, and your skin’s tolerance.
Beginners often start once or twice a week, then adjust the frequency based on how their skin responds.
In skincare, less is often more.
Consistency and a gentle approach are usually more important than an aggressive one.
Yes.
Exfoliating acids can make the skin more sensitive to sunlight. That’s why daily SPF is an important part of any routine that includes active ingredients.
UV protection helps protect the skin and support long-term skincare results.
Without regular SPF use, achieving the results you want may be more difficult.
Exfoliating acids are often combined with ingredients that support hydration and the skin barrier.
Popular partners include:
When combining acids with other active ingredients, such as retinoids, it’s best to proceed carefully and monitor how your skin reacts.
Exfoliating products are most often used after cleansing and before moisturizer.
A simple evening routine could look like this:
Cleanser → AHA/BHA/PHA product → Hydrating serum or moisturizer
The next morning, remember to apply SPF.
AHA, BHA, and PHA acids are among the most popular active ingredients in modern skincare. Although they all belong to the category of exfoliating acids, each one works a little differently and may be better suited to different skin needs.
The key to success is choosing the right product, introducing it gradually, and using sun protection consistently.
Because in skincare, the strongest product is not always the best one. The best choice is the one that suits your skin’s needs and that you can use consistently over the long term.
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