How AHAs Exfoliate
How AHAs Exfoliate — water-soluble alpha hydroxy acids, such as glycolic and lactic acid, that loosen the bonds holding dead cells together at the skin's surface so they shed more readily. By weakening these connections, they encourage smoother texture, more even tone, and brighter-looking skin over time. Being water-soluble, they act mainly on the surface and are often chosen for dryness, dullness, and uneven pigmentation.
Key points
- AHAs reduce cohesion between corneocytes in the outer skin layer, promoting gentle shedding.
- Glycolic acid is small and penetrates readily, while lactic acid is larger and often gentler and more hydrating.
- Regular use can improve surface smoothness, radiance, and the appearance of uneven tone.
- AHAs can increase sun sensitivity, making daily sunscreen important during use.
Frequently asked
What is the difference between glycolic and lactic acid?
Glycolic acid has a smaller molecule and penetrates more deeply, while lactic acid is larger, tends to be gentler, and also has humectant properties.
Do I need sunscreen when using AHAs?
Yes; AHAs can make skin more sensitive to UV light, so daily broad-spectrum sunscreen is recommended while using them.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
