AHA vs BHA: Chemical Exfoliants Made Simple
Throw away your scrubs. Chemical exfoliation is gentler and more effective. Here is which one you need.
What Are Chemical Exfoliants?
They dissolve the glue holding dead skin cells together, revealing fresh skin underneath. Unlike physical scrubs, they do not cause micro-tears.
AHA (Alpha Hydroxy Acid) — Surface Exfoliant
Water-soluble. Works on the skin surface. Best for dry, sun-damaged, or aging skin.
- Glycolic acid (small molecule, deepest penetration, most effective, most irritating)
- Lactic acid (larger molecule, gentler, also hydrating — best AHA for beginners)
- Mandelic acid (largest AHA molecule, gentlest, good for sensitive and dark skin)
Benefits: Brighter skin, smoother texture, faded dark spots, reduced fine lines
BHA (Beta Hydroxy Acid / Salicylic Acid) — Deep Pore Exfoliant
Oil-soluble. Penetrates INTO pores. Best for oily, acne-prone, and blackhead-prone skin.
- Salicylic acid 2% is the standard effective concentration
- Dissolves sebum inside pores
- Anti-inflammatory properties
Benefits: Clearer pores, fewer blackheads, less oil, reduced acne
AHA vs BHA Quick Comparison
| Feature | AHA | BHA |
|---|
| Solubility | Water | Oil |
| Penetration | Surface only | Into pores |
| Best for | Dry, aging, dull skin | Oily, acne, blackheads |
| Sun sensitivity | Increases (SPF required) | Does not increase |
| Frequency | 1-3x/week | 2-4x/week or daily |
Products
Paula's Choice 2% BHA Liquid
The BHA gold standard. Unclogs pores like nothing else.
$28-32
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The Ordinary Lactic Acid 5%
Gentle AHA entry point. Hydrating while exfoliating.
$7-9
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Glycolic Acid 7% Toning Solution
Affordable daily AHA toner for brighter, smoother skin.
$8-10
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Drunk Elephant T.L.C. Sukari Babyfacial
25% AHA + 2% BHA mask. Weekly intensive treatment.
$80-90
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