INGREDIENT GUIDE
What is Glycolic Acid?
Complete Guide & Best Products
Summary
Author
David, askINKEY Digital Skincare Advisor
Published
28th July, 2026
Time to read
10-12 mins
Last updated
28th July, 2026
Summary
Glycolic acid is the gold-standard Alpha Hydroxy Acid (AHA) for dull, rough and uneven skin. It has the smallest molecular size of any AHA, which means it penetrates the skin's surface more effectively than any other exfoliating acid in its class. By dissolving the bonds holding dead skin cells to the surface, it boosts natural cell renewal to reveal brighter, smoother, more even skin - on your face and across your body.
Whether you are dealing with dull skin, uneven texture, blackheads, keratosis pilaris (KP) bumps, strawberry skin or rough elbows and heels, glycolic acid is the ingredient built to address them all. This guide covers everything you need to know: what it is, how it works, how to use it safely on face and body, and which INKEY List products to start with.
Quick Facts About Salicylic Acid
What it does
Exfoliates the skin's surface, boosts cell renewal, visibly brightens, smooths texture, reduces blackheads, KP bumps and strawberry skin
Best for
Normal, combination and oily skin; dull, rough or uneven texture; body concerns like KP, ingrown hairs, strawberry skin and rough patches
Can be used with
Hyaluronic Acid, Niacinamide (alternate routines), Lactic Acid, Witch Hazel, Shea Butter
When to use
Face: PM only. Body: AM or PM; Body Wash in the shower 2-3x per week
Our top pick
Glycolic Acid Exfoliating Body Stick - £15
Glycolic Acid Toner - £13
Glycolic Acid Exfoliating Body Wash - £12
Key Benefits at a Glance:
- Boosts natural skin cell renewal
- Visibly brightens dull skin
- Smooths rough, uneven texture on face and body
- Reduces the appearance of blackheads, enlarged pores and fine lines
- Targets KP bumps, strawberry skin and body breakouts
- Clinically proven to improve keratosis pilaris (KP) in 7 days*
- Pregnancy and breastfeeding safe
*4-week clinical study of 21 people (Glycolic Acid Exfoliating Body Stick)
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 here.
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" or "strawberry 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 discolouration - 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 body washes (rinse-off, all-over):A rinse-off wash brings glycolic acid into the shower, exfoliating all-over body skin as you cleanse. The INKEY List Glycolic Acid Exfoliating Body Wash pairs 5% Glycolic Acid with 5% Lactic Acid - a dual-acid formula that smooths rough skin, reduces KP bumps and strawberry skin, and helps clear body breakouts, used just 2-3 times per week.
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 Wash in the shower and the Glycolic Acid Exfoliating Body Stick as the targeted leave-on step - a complete head-to-toe renewal routine built on one hero ingredient.
Benefits of Glycolic Acid for Skin
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 moisturiser 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 all-over smoothing, the Glycolic Acid Exfoliating Body Wash exfoliates as you cleanse, 2-3 times per week.For the full texture picture, read our guide on how to improve skin texture →
Clinically Proven Results on Keratosis Pilaris (KP) and Strawberry Skin
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 discolouration in 28 days, and improves dry, hard, cracked heels in 3 days.* For strawberry skin - the dark dots left by clogged pores and follicles - the dual-acid Body Wash targets the cause in the shower, while the Body Stick treats stubborn areas between washes. Read our complete guide to treating keratosis pilaris and our guide to [saying goodbye to strawberry skin →
*4-week consumer study of 100 people. **4-week clinical study of 21 people.
*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
| Skin Type | How Glycolic Acid Helps |
|---|---|
| Normal | Maintains brightness and smooth texture; an ideal renewal boost. |
| Combination | Evens texture and tone; Witch Hazel in the Glycolic Acid Toner helps balance oilier zones. |
| Oily | Clears surface buildup that contributes to congestion and blackheads. |
| Dull or uneven skin (any age) | Restores radiance and promotes a more even-looking skin tone with consistent use. |
| Sensitive | Choose a gentler PHA instead - PHA Toner for the face or PHA Body Water Cream for the body. |
How to Use Glycolic Acid
On Your Face (PM Only)
- Cleanse - a gentle cleanser like the Glycerin Gentle Purifying Cleanser → or, for oilier skin, the Salicylic Acid Cleanser →
- Hydrate - apply Hyaluronic Acid Serum → to damp skin
- Glycolic Acid Toner → saturate a cotton pad and sweep over face and neck. No rinse needed. Start 1-3x per week and build gradually
- Moisturise - seal in hydration with your preferred moisturiser
- Next morning: SPF - non-negotiable when using any exfoliating acid. Finish your AM routine with SPF
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)
Step 1 - Wash (in the shower, 2-3x per week): Massage the Glycolic Acid Exfoliating Body Wash over damp skin, focusing on rough or bumpy areas, then rinse thoroughly. The 5% Glycolic + 5% Lactic dual-acid formula exfoliates all over as you cleanse.
Step 2 - Treat (on dry skin): 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.
INKEY Pro Tip: On days you use the Body Wash, target only your most stubborn areas with the Body Stick - or alternate days entirely - and let skin build tolerance gradually. Avoid stacking both at full frequency from day one.
| Concern | How to Apply |
|---|---|
| KP bumps / strawberry skin | Use the Glycolic Acid Exfoliating Body Wash 2–3x per week all over the body. Apply the Glycolic Acid Exfoliating Body Stick up to 2x daily on stubborn areas. |
| Ingrown hairs | Apply the Glycolic Acid Exfoliating Body Stick up to 2x daily**. Reduce to 1x daily** once the area has improved. |
| Body breakouts | Use the Glycolic Acid Exfoliating Body Wash 2–3x per week, then apply the Glycolic Acid Exfoliating Body Stick up to 2x daily to unclog pores and target persistent breakouts. |
| Underarm or bikini discolouration | Apply the Glycolic Acid Exfoliating Body Stick 1x daily. Wait 10–15 minutes before applying deodorant and 8 hours after hair removal before use. |
| Dry, cracked heels | Apply the Glycolic Acid Exfoliating Body Stick up to 2x daily. For an intensive overnight treatment, apply a thicker layer and wear socks. |
Follow with a body moisturiser 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
| Product | Amount | Application Method |
|---|---|---|
| Glycolic Acid Toner | Saturate a cotton pad | Sweep over the face and neck after cleansing and hydrating. Use PM only. Do not rinse. |
| Glycolic Acid Exfoliating Body Wash | A generous amount | Massage over damp skin in the shower 2–3x per week, then rinse thoroughly. |
| Glycolic Acid Exfoliating Body Stick | Glide directly onto skin | Apply directly to clean, dry target areas. Use AM or PM. Do not rinse. |
Glycolic Acid vs Other Ingredients
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 blemishes. For dull, rough or uneven skin, glycolic acid is the primary choice. For oily and blemish-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 Lactic Acid
Both are AHAs, but lactic acid is a larger molecule, so it works more gently and closer to the surface, with added hydrating benefits. They are highly complementary - which is exactly why the Glycolic Acid Exfoliating Body Wash pairs 5% of each: glycolic for deeper renewal, lactic for gentle surface smoothing and hydration.
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 instead. 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
| Ingredient | Type | How It Works | Best For |
|---|---|---|---|
| Glycolic Acid | Water-soluble AHA (smallest molecule) | Exfoliates the skin's surface, boosts cell renewal, and helps brighten and smooth skin. | Dull skin, uneven texture, blackheads, KP, and body roughness |
| Lactic Acid | Water-soluble AHA (larger molecule) | Gently exfoliates while helping to hydrate and support the skin barrier. | Smoothing skin with less irritation; pairs well with Glycolic Acid |
| Salicylic Acid | Oil-soluble BHA | Penetrates deep into pores to dissolve excess oil and clear congestion. | Oily, blemish-prone skin, and blackheads |
| PHA | Large-molecule acid | Provides gentle surface exfoliation while helping to hydrate the skin. | Sensitive, dry, or reactive skin |
| Niacinamide | Vitamin B3 | Helps regulate excess oil production and visibly calm redness. | Oil control, visible pores, and redness |
Can You Use Glycolic Acid with Other Actives?
| Ingredient | Compatible? | Notes |
|---|---|---|
| Hyaluronic Acid | Yes | Apply before Glycolic Acid Toner to help cushion the skin with hydration. |
| Lactic Acid | Yes, in one formula | Already pre-blended at safe levels in the Glycolic Acid Exfoliating Body Wash. Do not layer with additional AHA products. |
| Niacinamide | Yes, when alternated | Use Niacinamide in the AM and Glycolic Acid in the PM, or alternate on different nights. |
| Vitamin C | Alternate | Use Vitamin C in the AM and Glycolic Acid in the PM on separate routines. |
| Retinol | Alternate nights | Do not use in the same routine. Build tolerance to each ingredient separately. |
| Other AHAs/BHAs | Avoid stacking | Use only one exfoliating acid product per routine to help minimise the risk of irritation. |
The INKEY List Glycolic Acid Products
INKEY's glycolic acid range is built around two heroes: a targeted body stick for 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 (£15 | 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, SheerLuxe 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 discolouration 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.
Glycolic Acid Toner (£13 | 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 discolouration
- Sensitive skin? Choose the PHA Toner →
How to use: After cleansing and hydrating, saturate a cotton pad and sweep over face and neck. No rinse needed. Follow with moisturiser. Always finish with SPF the next morning.
Glycolic Acid Exfoliating Body Wash (£12 | 250ml)
The in-shower step: a dual-acid body wash that exfoliates all-over body skin as you cleanse - your answer to rough texture, KP bumps, strawberry skin and body breakouts.
What makes it unique:
- 5% Glycolic Acid - dissolves dead surface cells for smoother, brighter body skin
- 5% Lactic Acid - a gentler, larger-molecule AHA that smooths and supports hydration, making the dual-acid formula effective without being harsh
- Rinse-off format - exfoliation built into your shower routine; no extra steps
- Targets: rough, bumpy skin, KP, strawberry skin and body breakouts
How to use: In the shower, 2-3x per week. Massage over damp skin, focusing on rough or bumpy areas, then rinse thoroughly. Follow with the Body Stick on stubborn areas and moisturiser all over. Read the full launch story →
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.
Glycolic Acid Side Effects & Precautions
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
| Side Effect | Why It Happens | What To Do |
|---|---|---|
| Mild tingling | A normal sign the acid is working | Usually fades quickly; no action needed |
| Dryness or irritation | Overuse or layering with other active ingredients | Reduce frequency and avoid using multiple exfoliating acids in the same routine |
| Stinging or burning | Skin sensitivity or over-exfoliation | Reduce frequency or discontinue use; switch to a gentler PHA if needed |
| Increased sun sensitivity | Exfoliating acids make skin more sensitive to UV exposure | Wear SPF daily — non-negotiable |
Who Should Proceed with Care
| Skin Profile | Guidance |
|---|---|
| Sensitive skin | Choose the PHA Toner (for the face) or PHA Body Water Cream (for the body) instead. |
| Using Retinol or Vitamin C | Alternate routines; do not use Glycolic Acid in the same routine. |
| Eczema, dermatitis, or prescription skincare | Check with your doctor or dermatologist before use. |
| Broken or irritated skin | Avoid applying until the skin is fully healed. |
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 →
Complete Your Glycolic Acid Routine
Face Routine (PM)
| Step | Product | Frequency |
|---|---|---|
| Cleanse | Your preferred cleanser | Daily |
| Hydrate | Hyaluronic Acid Serum | Daily |
| Exfoliate | Glycolic Acid Toner | 1–3x per week, building up gradually |
| Moisturise | Your preferred moisturiser | Daily |
| AM after: Protect | Dewy Sunscreen SPF 30 | Daily – essential when using exfoliating acids |
Body Routine (AM or PM)
| Step | Product | Frequency |
|---|---|---|
| Wash | Glycolic Acid Exfoliating Body Wash | 2–3x per week in the shower |
| Target | Glycolic Acid Exfoliating Body Stick | 2–3x per week, building up to daily as tolerated |
| Hydrate | PHA Body Water Cream on non-target areas | Daily |
| Protect | SPF on treated areas if exposed | Daily |
Product Combinations That Work
| Combination | Why It Works |
|---|---|
| Glycolic Acid Toner + Hyaluronic Acid Serum | Delivers skin renewal without dehydration — apply Hyaluronic Acid Serum first, followed by Glycolic Acid Toner. |
| Body Wash + Body Stick | Provides all-over exfoliation in the shower, with targeted treatment for stubborn areas between washes. |
| Body Wash or Body Stick + PHA Body Water Cream | Delivers exfoliation where you need it while maintaining gentle hydration everywhere else. |
| Glycolic Acid (PM) + Niacinamide (AM) | Supports overnight skin renewal while helping to control oil and calm skin during the day. |
| Body routine + SPF | Helps maintain smoother-looking skin while protecting treated areas from UV exposure. |
Ready To Transform Your Skin
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 £15 delivers clinically proven results on KP, ingrown hairs and rough skin in as little as 7 days, the Glycolic Acid Toner at £13 brings the same renewal power to your face, and the Glycolic Acid Exfoliating Body Wash at £12 builds exfoliation into every shower. Each works independently, and more powerfully together.
At The INKEY List, the mission has always been the same: real knowledge, effective formulas, accessible pricing. Clear guidance. Proven ingredients. Real results.
