Is Glycolic Acid safe during pregnancy?

There is limited safety data on Glycolic Acid during pregnancy. Exercise caution and consult your healthcare provider before use.

What skin types is Glycolic Acid best for?

Glycolic Acid is particularly well-suited to mature, combination, oily, dry skin. It may be less ideal for sensitive skin.

What ingredients pair well with Glycolic Acid?

Glycolic Acid layers well with hyaluronic acid, niacinamide, ceramides. These combinations are common in K-beauty routines and have no known negative interactions.

Can I use Glycolic Acid with retinol?

Both increase cell turnover — combined use risks over-exfoliation and barrier damage Consider alternating them (e.g. AM/PM) or using them on different days.

AHAWell-Known

Glycolic Acid

Also known as: AHA, alpha hydroxy acid, glycolic

5/5— Very Strong Evidence

Medically reviewed by ChokChok · Updated December 1, 2024

Glycolic acid is the smallest AHA molecule, which means it penetrates skin more effectively than its counterparts. It dissolves the bonds between dead skin cells, revealing smoother, brighter skin underneath. Among chemical exfoliants, it has the deepest evidence base.

What It Does

exfoliationbrighteningtexture improvementcollagen stimulation

Deep Dive

The Smallest AHA

Glycolic acid has the smallest molecular size of all alpha hydroxy acids, allowing it to penetrate the stratum corneum more effectively than lactic acid, mandelic acid, or other AHAs. This makes it the most potent AHA but also the most likely to cause irritation.

How It Works

AHAs work by dissolving the intercellular cement (desmosomes) that holds dead skin cells together. This accelerates natural desquamation, revealing fresher skin. At higher concentrations and with consistent use, glycolic acid also stimulates glycosaminoglycan and collagen production in the dermis.

Usage Guidelines

Start with a low concentration (5%) used 2-3 times per week. Build up gradually. Always use sunscreen when using AHAs — they increase photosensitivity by thinning the outer layer of dead cells that provides some UV protection. Evening use is preferred.

AHA vs BHA

While glycolic acid works on the skin surface (water-soluble), BHA (salicylic acid) is oil-soluble and can penetrate into pores. For acne and blackheads, BHA is generally the better choice. For surface texture, dullness, and anti-aging, AHAs are more effective.