Lactic Acid
ExfoliantHumectantNaturalAlso known as: AHA, Alpha Hydroxy Acid
A gentle alpha hydroxy acid derived from milk. Larger molecular size than glycolic acid means slower, more gentle penetration. Also has humectant properties.
Routine placement
Treatment · PM
Time to results
2-4 weeks for smoother texture; 6-8 weeks for improved hydration and tone
Gentle exfoliation, hydrates while exfoliating, improves skin texture, brightens skin, suitable for sensitive skin types.
Start with 5-10% concentration 2-3 times per week. Increase gradually. Apply to clean skin in evening. Follow with moisturizer.
Beginner
5%
Intermediate
10%
Advanced
15-40% (professional peel)
Well-tolerated exfoliant with additional moisturizing properties. Studies show improvement in photoaging signs with less irritation than glycolic acid.
Key Studies
Lactic acid as a humectant and exfoliant (2006)
Journal of Cosmetic Dermatology
Lactic acid is unique among AHAs: it exfoliates while simultaneously hydrating. It increases ceramide production in the epidermis, strengthening the barrier.
Lactic acid in photoaged skin (1996)
Dermatologic Surgery
12% ammonium lactate lotion applied daily significantly improved skin smoothness, fine wrinkles, and overall photodamage over 22 weeks.
AHA comparison: glycolic vs lactic (2010)
International Journal of Cosmetic Science
Lactic acid is gentler than glycolic acid due to its larger molecular size, resulting in slower, more uniform penetration and less irritation.
- active skin infections
- open wounds
Cautions
Milder than glycolic acid but still increases sun sensitivity. Patch test first if sensitive skin.
Lactic acid vs glycolic acid?
Lactic acid is gentler (larger molecule, slower penetration) and adds hydration. Glycolic acid is more potent for deep exfoliation. Choose lactic acid for sensitive or dry skin.
Can I use lactic acid on sensitive skin?
Yes — lactic acid is one of the most gentle chemical exfoliants. Start at 5% and it is usually well-tolerated even by sensitive skin types.
Does lactic acid help with dry skin?
Yes. Lactic acid is both an exfoliant and a humectant. It removes dead skin while increasing ceramide production and attracting moisture.
Can I use lactic acid with retinol?
Alternate nights rather than layering. Both increase cell turnover and combining them can compromise the skin barrier.
Does your skincare contain Lactic Acid?
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