What Is Glycolic Acid? — The Fastest AHA
Glycolic acid is the smallest-molecule AHA. Smallest = fastest penetration = strongest effect.
The science.
Glycolic acid is derived from sugarcane. As an AHA, it exfoliates surface skin layers and stimulates dermal repair.
How it works
Glycolic acid loosens dead-cell bonds and reaches the deeper dermis to stimulate collagen production. The stronger but riskier AHA.
Right for which skin types?
Sun-damaged skin. Tone and texture issues. Lighter skin tones (less risk of post-inflammatory hyperpigmentation).
How to use it
5-15% concentration. 2-3× weekly. Build slowly. Always wear SPF the next day.
Side effects
Initial dryness, increased UV sensitivity. Higher hyperpigmentation risk on darker skin.
Top recommendations.
- Glycolic Acid 7% Toning Solution by The Ordinary — $20 · Best value
- Liquid Gold by Alpha-H — $60 · Australian formulation
- Resurfacing Peel Pads by Dr. Dennis Gross — $135 · Premium pre-event
Common questions.
Glycolic vs lactic acid?
Glycolic is stronger; lactic is gentler and more hydrating. Use glycolic for tone, lactic for sensitive skin.
How often glycolic acid?
2-3× weekly. Daily use causes barrier breakdown.
Glycolic + retinol?
Don't layer the same night. Alternate.