The ingredient narratives reshaping clean beauty.
Lactic Acid
aka l-lactic acid · lactate
The hydration-positive AHA — exfoliates while doubling as a humectant via incorporation into the skin's natural moisturizing factor (NMF). Best entry-point acid for sensitive skin and the only AHA with strong evidence for direct ceramide synthesis stimulation. Versed and Sunday Riley have made low-percentage daily lactic the new normal.
- gentlest of the major AHAs
- doubles as humectant via NMF integration
- stimulates ceramide synthesis at moderate doses
- gentle resurfacing serums
- AHA toners
- hydrating peel pads
5–10% leave-on at pH 3.5–4 is the sweet spot. L-lactic acid (the bio-derived form) is preferred over racemic DL-lactic. Pairs naturally with hyaluronic acid and ceramides for hydration-led resurfacing.
Photosensitizing — daily SPF required. Over 10% requires acid tolerance.
Strongly positive — the AHA clean brands reach for first.
The ingredient narratives reshaping clean beauty.
Lactic Acid
aka l-lactic acid · lactate
The hydration-positive AHA — exfoliates while doubling as a humectant via incorporation into the skin's natural moisturizing factor (NMF). Best entry-point acid for sensitive skin and the only AHA with strong evidence for direct ceramide synthesis stimulation. Versed and Sunday Riley have made low-percentage daily lactic the new normal.
- gentlest of the major AHAs
- doubles as humectant via NMF integration
- stimulates ceramide synthesis at moderate doses
- gentle resurfacing serums
- AHA toners
- hydrating peel pads
5–10% leave-on at pH 3.5–4 is the sweet spot. L-lactic acid (the bio-derived form) is preferred over racemic DL-lactic. Pairs naturally with hyaluronic acid and ceramides for hydration-led resurfacing.
Photosensitizing — daily SPF required. Over 10% requires acid tolerance.
Strongly positive — the AHA clean brands reach for first.