Confused Between Lactic and Glycolic Acid? One Works — The Other Wrecks Sensitive Skin
If you’ve got sensitive skin, choosing the wrong exfoliant isn’t just ineffective — it’s a fast track to irritation, redness, and flare-ups.
Google’s flooded with generic skincare lists. What you need is a clinical breakdown: What works, what backfires, and what derms actually recommend for sensitive, reactive, or redness-prone skin in 2025.
We’ll settle the Lactic vs Glycolic debate — with real-world data, product picks, and a usage routine that won’t destroy your barrier.
TL;DR: Which One Wins?
Lactic Acid is better for sensitive skin.
It’s larger in molecule size, penetrates more slowly, and is clinically proven to be less irritating.
Glycolic is faster — but harsher. Sensitive skin? Don’t risk it.
What’s the Difference Between Lactic and Glycolic Acid?
| Feature | Lactic Acid | Glycolic Acid |
|---|---|---|
| Molecule Size | Larger | Smaller |
| Penetration Speed | Slower (gentler) | Faster (more aggressive) |
| Best For | Sensitive skin, dryness, dullness | Oily skin, acne scars, thickened texture |
| Hydration | Acts as a humectant | Can be drying |
| Irritation Risk | Low | High, especially on thin or reactive skin |
| Ideal % for Home Use | 5%–10% | 5%–7% (any higher = pro-level) |
Who Should Use Lactic Acid?
Use Lactic Acid if you:
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Have sensitive, dry, or easily irritated skin
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Experience redness, tightness, or flaking with other acids
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Want gentle brightening and hydration, not a chemical peel
Lactic is an AHA that exfoliates without compromising your barrier — and it draws water into the skin, unlike Glycolic.
Who Should Use Glycolic Acid?
Use Glycolic Acid only if you:
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Have oily, thick, or acne-prone skin
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Already tolerate actives like retinol or vitamin C
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Want fast resurfacing — and don’t mind a little sting
Glycolic is more aggressive, and while powerful, it’s often too much for sensitive skin — especially around the cheeks or under-eye area.
Red-Approved Products (2025)
Best Lactic Acid for Sensitive Skin:
The Ordinary Lactic Acid 5% + HA
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Ultra-affordable, beginner-friendly
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Bonus: Hyaluronic Acid for hydration
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Use 2–3x/week after cleansing
→ [Affiliate link or product CTA]
Naturium Lactic Acid 10% Resurfacing Serum
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Stronger but buffered
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Good for building tolerance slowly
→ [View full review]
Glycolic Acids (Use With Caution if Sensitive):
Paula’s Choice 8% AHA Gel Exfoliant
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Very effective — but start slow
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Not recommended for rosacea or barrier issues
→ [See usage precautions]
The Ordinary Glycolic Acid 7% Toning Solution
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cult classic — but many react to it
→ [Is it too harsh for you?]
How to Use Acids Safely on Sensitive Skin
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Apply only at night
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Start with once a week, then build to 2–3x/week
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Always apply to dry skin (wet skin = more absorption = more irritation)
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Follow with ceramide-rich moisturizer
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SPF 50 every single morning — no exceptions
What to Never Mix With Lactic or Glycolic Acid
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Vitamin C (can destabilize pH) -
Retinoids (alternate nights only)
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Physical scrubs (damages barrier)
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Fragrance-heavy toners or actives
Lactic Acid Wins for Sensitive Skin in 2025
Glycolic is strong — but it’s a blunt instrument.
Lactic Acid gives you results without wrecking your skin barrier.
If you’re:
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Dealing with dry patches, tightness, or post-acne redness…
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Struggling with actives burning your skin…
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Tired of products making things worse…
Then Lactic Acid is your best move.
Next Step: Find Your Acid Match
Take the 30-Second Acid Quiz
→ Discover the exact exfoliant based on your skin tone, sensitivity, and pigmentation type.
30-Second Acid Match Quiz