AHA (Alpha Hydroxy Acid)
AHA (Alpha Hydroxy Acid) — a group of water-soluble acids used in skincare to exfoliate the surface of the skin by loosening the bonds between dead skin cells. Common examples include glycolic and lactic acid, which are often used to improve texture, tone, and the appearance of dullness.
Key points
- AHAs are water-soluble, so they primarily work on the skin's surface rather than deep within pores.
- Glycolic acid is one of the smallest AHA molecules, while lactic acid is often considered gentler and more hydrating.
- Regular use can help improve the look of uneven texture, fine lines, and dull or discolored skin over time.
- AHAs can increase sun sensitivity, so daily sunscreen use is generally recommended alongside them.
Frequently asked
What is the difference between AHAs and BHAs?
AHAs are water-soluble and mainly exfoliate the skin's surface, while BHAs are oil-soluble and can penetrate into pores. AHAs are often favored for texture and tone, and BHAs for oily or congested skin.
Do AHAs make skin more sensitive to the sun?
Yes, AHAs can increase the skin's sensitivity to UV light, both during use and for a period afterward. Applying broad-spectrum sunscreen daily is generally recommended.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
