They are the two most popular chemical exfoliants in American drugstores, and people constantly pick the wrong one. Glycolic acid (an AHA) and salicylic acid (a BHA) are both acids — but they work on different parts of the pore, suit different skin types, and treat different problems. This guide is based on dermatology literature from the Journal of the American Academy of Dermatology and the American Academy of Dermatology's patient guidance.
Simple rule: surface problems → glycolic. Pore problems → salicylic.
| Factor | Glycolic Acid (AHA) | Salicylic Acid (BHA) | |--------|---------------------|----------------------| | Solubility | Water | Oil | | Works where | Skin surface | Inside pores | | Blackheads/clogged pores | ⚠️ Modest | ✅ Excellent | | Dullness/texture/glow | ✅ Excellent | ⚠️ Modest | | Fine lines | ✅ Moderate | ❌ Minimal | | Oily skin | ⚠️ Can feel good but doesn't de-grease | ✅ Reduces oil in pore | | Dry skin | ✅ Good (with moisturizer) | Can be drying | | Sensitive skin | Higher sting risk | Generally gentler | | Sun sensitivity | ✅ Increases (SPF mandatory) | Minimal increase | | Typical strength | 5–10% home, 20–70% peels | 0.5–2% home, higher peels |
| Product | Strength | Price (USD) | |---------|----------|-------------| | The Ordinary Glycolic Acid 7% Toning Solution | 7% | $9–13 | | Pixi Glow Tonic | 5% | $15–29 | | Alpha Skin Care Essential Renewal | 10% | $14–20 | | Naturium Glycolic Acid 8% Toner | 8% | $16–19 |
Buy: The Ordinary Glycolic Acid 7% on Amazon | Ulta | Sephora Buy: Pixi Glow Tonic on Amazon | Target | Ulta
| Product | Strength | Price (USD) | |---------|----------|-------------| | Paula's Choice 2% BHA Liquid Exfoliant | 2% | $29–35 | | The Ordinary Salicylic Acid 2% Solution | 2% | $6–9 | | CeraVe SA Smoothing Cleanser | ~0.5% | $12–16 | | Neutrogena Oil-Free Salicylic Acid Acne Wash | 2% | $8–11 | | Stridex Maximum Strength Pads | 2% | $4–6 |
Buy: Paula's Choice 2% BHA Liquid on Amazon | Sephora | Ulta Buy: CeraVe SA Cleanser on Amazon | Walmart | Target | CVS Buy: Stridex Pads on Amazon | Walmart | Dollar General
Yes, but not in the same session when starting out. Standard protocols:
If you use a retinoid (retinol, adapalene, tretinoin), keep acids on separate nights from it. One active per night is the beginner's golden rule.
Salicylic acid, decisively. It is oil-soluble and physically gets inside the pore to dissolve the plug. Glycolic only exfoliates the surface around it.
Yes, but alternate nights at first. Same-night layering (BHA then AHA) is possible for well-adapted skin but significantly raises irritation. If you feel burning or see flaking, separate them.
For flat post-inflammatory dark marks, glycolic acid helps more — it accelerates turnover of pigmented cells. For textural acne scarring, neither home acid is sufficient; see a dermatologist about professional peels, microneedling, or lasers.
At 0.5–2% in a well-formulated product, it is surprisingly tolerable for most. Cleanser formats dry the least. If you experience tightness, cut frequency and moisturize after — and skip products that combine SA with alcohol-heavy bases.
Vitamin C (L-ascorbic acid) works best at low pH, as do AHAs — layering can irritate. Practical pattern: vitamin C in the morning, acid at night. If your vitamin C is a gentle derivative (SAP, THD ascorbate), layering is usually fine.
Sources: Journal of the American Academy of Dermatology (JAAD), Journal of Drugs in Dermatology, Dermatologic Surgery, American Academy of Dermatology (AAD), Clinical Cosmetic and Investigational Dermatology.
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