STEP 03 OF 6
Expert Review
The expert reads your actual content and gives specific, actionable feedback.
Your expert reads the full article, highlights claims, and adds detailed feedback inline.
Dr. Elena Vasquez, MD, FAAD
Board-Certified Dermatologist
What Is Glycolic Acid and How Does It Work?
Glycolic acid, the smallest alpha-hydroxy acid (AHA), has become a cornerstone of evidence-based skincare. Clinical trials demonstrate that 8–10% glycolic acid formulations can reduce fine lines by up to 23% over 12 weeks.
“reduce fine lines by up to 23% over 12 weeks”
Well-supported claim. The Bernstein 2001 study is the gold standard here. I'd note this applies specifically to periorbital wrinkles; results for nasolabial folds are typically more modest (12–15%).
When applied topically, glycolic acid accelerates cellular turnover by loosening the bonds between dead skin cells in the stratum corneum. This exfoliation process reveals fresher skin beneath and can improve hyperpigmentation in as few as 4 weeks of consistent use.
“accelerates cellular turnover by loosening the bonds between dead skin cells in the stratum corneum”
Correct mechanism. Worth noting pH dependency: efficacy drops significantly above pH 4.0. The desmosome disruption pathway is well-established in Tang 2018.
“improve hyperpigmentation in as few as 4 weeks”
I'd qualify this: 4 weeks is realistic for mild post-inflammatory hyperpigmentation (PIH). Melasma requires 8–12 weeks minimum, and results are highly dependent on concurrent sun protection.
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Personal Expert Memo
“I first became interested in alpha-hydroxy acids during my residency at UCLA, when a patient with severe post-inflammatory hyperpigmentation responded dramatically to a graduated glycolic protocol. That case changed how I approach chemical exfoliation. Over 12 years of clinical practice, I've seen hundreds of patients benefit from the exact approach described in this article: starting low, increasing gradually, and pairing with barrier repair. The science here is sound, and the practical guidance matches what I recommend in my own clinic every day.”