AHA and BHA are two common categories of exfoliating acids, but they are not interchangeable. Their chemical properties and typical skincare uses are different.
What is an AHA?
AHA stands for alpha hydroxy acid. Common examples include glycolic acid, lactic acid and mandelic acid. AHAs are used primarily to exfoliate the skin surface and improve the appearance of dullness, rough texture and uneven tone.
What is a BHA?
BHA stands for beta hydroxy acid. In skincare, the best-known example is salicylic acid. It is oil-soluble and commonly used in formulas for oily or blemish-prone skin and the appearance of clogged pores.
AHA vs BHA at a glance
| AHA | BHA | |
|---|---|---|
| Common examples | Glycolic, lactic, mandelic | Salicylic acid |
| Typical focus | Surface texture, dullness, uneven tone | Oiliness, congestion, blemish-prone skin |
| Common formats | Toners, serums, pads, peels | Cleansers, toners, serums, spot products |
Which should you choose?
If your main concern is rough texture or dullness, an AHA may be a logical option. If congestion or oiliness is your main concern, a BHA product may be more relevant. Some formulas combine both.
Can you use AHA and BHA together?
Possibly, but it is easy to overdo exfoliation. Unless the product is specifically formulated to combine them, beginners often do better using one exfoliating product at a time.
How do you know if you are exfoliating too much?
Persistent stinging, tightness, flaking and increased sensitivity can all be signs that the routine is too aggressive.
Related guides
This guide is for general cosmetic skincare education only and is not medical advice. Individual skin responses vary. Follow the directions supplied with each product, introduce new active products gradually, and seek advice from a qualified healthcare professional if you have persistent irritation or a skin condition.
References & further reading
See Jymoor Skincare Guide Editorial Standards for how we select and review educational sources.
