What is Glycolic Acid?

Glycolic acid is an Alpha Hydroxy Acid (AHA), naturally derived from sugar cane, and it has been a cornerstone of professional and at-home exfoliation for decades. What sets it apart from other exfoliating ingredients is a single, defining characteristic: it is the smallest AHA molecule there is. That size matters enormously. Because the molecule is so small, glycolic acid penetrates the skin's surface more efficiently than larger AHAs like lactic acid or mandelic acid, delivering more effective exfoliation at the same concentration.

Where BHAs like salicylic acid are oil-soluble and work inside the pore, glycolic acid is water-soluble and works on the skin's surface. It dissolves the bonds that hold dead skin cells together at the outermost layer of skin. Those dead cells are what make skin look dull, feel rough and cling to congestion. By loosening and lifting them away, glycolic acid reveals the fresher, brighter skin underneath and signals the skin to speed up its natural renewal cycle. See how AHAs compare to BHAs and PHAs →

The Science Behind Glycolic Acid

Glycolic acid works through two connected mechanisms. First, it is keratolytic: it breaks down the keratin bonds holding dead skin cells to the surface, accelerating the natural shedding process that slows down with age, sun exposure and dryness. Second, it stimulates cell renewal. As the surface layer is cleared, the skin responds by producing fresh cells at a faster rate, which is why consistent glycolic acid use improves not just how skin looks this week, but how it behaves over months.

This is also why glycolic acid is so effective for body concerns like keratosis pilaris. KP bumps, often called "chicken skin", are caused by keratin buildup blocking hair follicles. Because glycolic acid dissolves keratin directly, it addresses the root cause of the bumps rather than just scrubbing at the surface. Unlike physical scrubs, which can cause micro-tears and inflammation that make bumps worse, chemical exfoliation works gently at the cellular level.

Types of Glycolic Acid in Skincare

In toners (leave-on, face):
A leave-on toner is the classic face format for glycolic acid. Swept over skin after cleansing, it delivers even, controlled exfoliation across the whole face. The INKEY List Glycolic Acid Toner uses this format at 10%, combined with 5% Witch Hazel to help control excess oil and calm skin, at a pH of 3.6 to 4.0, the optimal range for the acid to remain active and effective.

In body sticks (leave-on, targeted):
A solid stick format delivers concentrated glycolic acid exactly where it is needed - KP bumps, ingrown hairs, rough elbows and knees, cracked heels, underarm discoloration - with no mess and no rinsing. The INKEY List Glycolic Acid Exfoliating Body Stick uses 7% Glycolic Acid alongside 0.5% Salicylic Acid to unclog pores and 10% Shea Butter to nourish and protect, so skin is exfoliated without being stripped.

In scalp treatments:
Glycolic acid is not just for skin. The INKEY List Glycolic Acid Exfoliating Scalp Scrub uses it to remove product buildup from the scalp, leaving hair looking healthier.

For most people, the most effective approach is to combine the Glycolic Acid Toner as the face step with the Glycolic Acid Exfoliating Body Stick as the targeted body step - a complete head-to-toe renewal routine built on one hero ingredient.

Visibly Brightens Dull Skin

Dullness is, at its core, a buildup problem. Dead skin cells accumulate on the surface, scattering light unevenly and leaving skin looking flat and tired. Glycolic acid clears that buildup and accelerates renewal, so the skin surface reflects light evenly again. With consistent use of the Glycolic Acid Toner, most people see results within 6 weeks. Consistency matters more than intensity - more is not better with active exfoliants.

Smooths Rough, Uneven Texture

Because glycolic acid dissolves the bonds between dead surface cells, rough and bumpy texture improves steadily with regular use. On the face, that means a smoother base under moisturizer and makeup. On the body, the results are even more dramatic: the Glycolic Acid Exfoliating Body Stick visibly improves dry, rough and flaky skin after the first use, and instantly softens dry, rough elbows and knees.* For the full texture picture, read our guide on how to improve skin texture →

Clinically Proven Results on Keratosis Pilaris (KP)

KP affects around 40% of adults, and glycolic acid is the most effective over-the-counter ingredient for it. The Body Stick is clinically proven to visibly improve keratosis pilaris in just 7 days.** It also visibly reduces ingrown hairs in 7 days, body breakouts in 7 days, underarm and bikini line discoloration in 28 days, and improves dry, hard, cracked heels in 3 days.* Read our complete guide to treating keratosis pilaris →

*4-week consumer study of 100 people. **4-week clinical study of 21 people.

Reduces Blackheads, Enlarged Pores and Fine Lines

By keeping the skin's surface clear of dead cell buildup, glycolic acid helps reduce the appearance of blackheads and enlarged pores, and the renewal boost softens the look of fine lines over time. The 10% concentration in the Glycolic Acid Toner is formulated to deliver impactful exfoliation while remaining suitable for most skin types.

Which Skin Types Benefit Most

On Your Face (PM Only)

1. Cleanse - a gentle cleanser like the Glycerin Gentle Purifying Cleanser or, for oilier skin, the Salicylic Acid Cleanser
2. Hydrate - apply Hyaluronic Acid Serum to damp skin
3. Glycolic Acid Toner - saturate a cotton pad and sweep over face and neck. No rinse needed. Start 1-3x per week and build gradually
4. Moisturize - seal in hydration with your preferred moisturizer
5. Next morning: SPF - non-negotiable when using any exfoliating acid. Finish your AM routine with S{F

INKEY Pro Tip: Do not layer the Glycolic Acid Toner with other exfoliating acids (AHAs/BHAs), Retinol or Vitamin C in the same routine. Alternate instead: Vitamin C in the AM, glycolic acid or Retinol in the PM on different nights. A mild tingle on application is normal and fades quickly - it is a sign the acid is working.

On Your Body (AM or PM)

Apply the Glycolic Acid Exfoliating Body Stick directly to clean, dry skin - no rinsing needed. Start 2-3 times per week and increase to daily if skin tolerates it.

Follow with a body moisturizer or PHA Body Water Cream on non-target areas, and apply SPF to treated areas if exposed to sun. New to body exfoliation? Start with our guide on how to exfoliate body skin →

How Much to Use

Glycolic Acid vs Salicylic Acid

Both are exfoliants, but they are fundamentally different. Glycolic acid is a water-soluble AHA that works on the skin's surface: texture, tone, brightness and renewal. Salicylic acid is an oil-soluble BHA that penetrates inside the pore: congestion, excess oil and breakouts. For dull, rough or uneven skin, glycolic acid is the primary choice. For oily and acne-prone skin, salicylic acid leads. Many complete routines use both - just alternate rather than stack. Read our full Glycolic Acid vs Salicylic Acid guide →

Glycolic Acid vs PHA

PHAs (Polyhydroxy Acids) are the largest exfoliating acid molecules, which makes them the gentlest - they work slowly at the very surface with minimal irritation risk. Glycolic acid is the smallest and most effective. If your skin is resilient and you want visible results, choose glycolic. If your skin is sensitive or reactive, choose the PHA Toner. Read our full PHA Toner vs Glycolic Acid Toner guide →

Glycolic Acid vs Niacinamide

These two are complementary, not competing. Glycolic acid exfoliates and renews; Niacinamide regulates oil, calms redness and supports the barrier. The safest way to combine them is to alternate - Niacinamide Serum in the AM, Glycolic Acid Toner in the PM. Can you use niacinamide and glycolic acid together? Full guide →

How Glycolic Acid Compares: At a Glance

Can You Use Glycolic Acid with Other Actives?

INKEY's glycolic acid range is built around two heroes: a targeted body stick with clinically proven results on KP, ingrown hairs and rough skin, and a brightening face toner for smoother, more radiant skin. Together they cover glycolic acid from head to toe.

Glycolic Acid Exfoliating Body Stick ($17 | 45g)

Our TikTok viral, Allure Best of Beauty award-winning body stick targets multiple body concerns in one mess-free swipe. Rated 4.4 stars from 655 reviews and featured by Vogue, Glamour and Women's Health.

What makes it unique:

• 7% Glycolic Acid - exfoliates surface skin cells to smooth rough, bumpy texture
• 0.5% Salicylic Acid - unclogs pores to target breakout-prone skin and ingrown hairs
• 10% Shea Butter - nourishes and protects, so skin is never stripped
• Solid stick format - precise, mess-free, no rinsing; just glide and go
• Fragrance-free, alcohol-free, Vegan Society certified - pregnancy and breastfeeding safe

Clinical claims:

• Clinically proven to visibly improve keratosis pilaris (KP) in 7 days**
• Visibly improves dry, rough and flaky skin after 1st use*
• Visibly reduces ingrown hairs in 7 days*
• Visibly reduces body breakouts in 7 days*
• Visibly reduces underarm and bikini line discoloration after 28 days*
• Visibly improves dry, hard, cracked heels in 3 days*

*4-week consumer study of 100 people. **4-week clinical study of 21 people.

How to use: AM or PM. Apply directly to clean, dry skin. Start 2-3x per week, build to daily as tolerated. No rinse needed.

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Glycolic Acid Toner ($18 | 100ml)

The face hero: a 10% glycolic acid toner that gently exfoliates, smooths texture and visibly brightens. Rated 4.4 stars from 241 reviews.

What makes it unique:

• 10% Glycolic Acid - boosts natural cell renewal and evens texture for brighter, smoother skin
• 5% Witch Hazel - helps control excess oil production and soothes skin
• pH 3.6 to 4.0 - the optimal range for glycolic acid to stay active and effective
• Lightweight, fast-absorbing - with a mild, short-lived tingle that shows it is working
• Fragrance-free, Vegan Society certified - pregnancy and breastfeeding safe

Targets: enlarged pores, uneven skin tone and texture, dull skin, blackheads.

Customer tips:

• PM only; start 1-3x per week and build gradually - never daily at first
• Can be used on breakout-prone areas like the back or chest
• Customers also use it on underarms, elbows and other body areas for smoothing and discoloration
• Sensitive skin? Choose the PHA Toner instead

How to use: After cleansing and hydrating, saturate a cotton pad and sweep over face and neck. No rinse needed. Follow with moisturizer. Always finish with SPF the next morning.

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Glycolic Acid Exfoliating Scalp Scrub ($14)

Glycolic acid for your scalp: removes product buildup and leaves hair looking healthy. Rated 4.4 stars from 199 reviews.

Shop Glycolic Acid Scalp Scrub

Is Glycolic Acid Safe?

Yes. Glycolic acid is one of the most thoroughly studied exfoliating ingredients in skincare. Both the Glycolic Acid Toner and the Glycolic Acid Exfoliating Body Stick are pregnancy and breastfeeding safe, fragrance-free, Vegan Society certified and dermatologically tested. The 10% face concentration and 7% body concentration are formulated for effective at-home use without professional supervision.

Does Glycolic Acid Make Skin Sun Sensitive?

Exfoliating acids can increase photosensitivity, which is why daily SPF is essential when using glycolic acid. Apply SPF every morning, and apply SPF to body areas treated with the Body Stick if they will be exposed to the sun.

Potential Side Effects

Who Should Proceed with Care

Overdone it? Here is what to do if you have over-exfoliated →

Patch Test First

Before introducing any new product, apply a small amount to a discreet area and wait 24 hours. Why patch testing matters →

Face Routine (PM)

Body Routine (AM or PM)

Product Combinations That Work

Glycolic acid is not simply an exfoliant. Used consistently and correctly, it is a complete renewal system for brighter, smoother skin from head to toe. The Glycolic Acid Exfoliating Body Stick at $17 delivers clinically proven results on KP, ingrown hairs and rough skin in as little as 7 days, and the Glycolic Acid Toner at $18 brings the same renewal power to your face. Each works independently, and more powerfully together - and free US shipping starts over $40.

At The INKEY List, the mission has always been the same: real knowledge, effective formulas, accessible pricing. Clear guidance. Proven ingredients. Real results.

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