Supersize Hyaluronic Acid Serum 100ml Duo

Key claims from recent clinical study of customers using Hyaluronic Acid Serum

How to layer Hyaluronic Acid Serum in your routine

Before and after of customer using Hyaluronic Acid Serum

Different Hyalurhnic Acid Serum bottle sizes and uses (30ml = 60 uses, 60ml = 120 uses, 100ml = 180 uses)

Model applying Hyaluronic Acid Serum to her face

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Supersize Hyaluronic Acid Serum 100ml Duo

Supersize Hyaluronic Acid Serum 100ml Duo | The INKEY List

Name: Supersize Hyaluronic Acid Serum 100ml Duo
Brand: The INKEY List EU
SKU: BUNTILEU080
Availability: InStock
Rating: 4.7 (2594 reviews)

Double up on our non-tacky hydrating serum, now x3 the size!

4.7

Rated 4.7 out of 5 stars

4.7 Stars (2,594 Reviews)

€41,80 ~~€44,00~~ / 2 full-size products

Free delivery on your first order!

Worth 205 Points

WHAT YOU GET: A lightweight hydrating serum that delivers instant and lasting hydration, leaving your skin plump, smooth, and ready for the day.

WHY IT WORKS: 2% Multi-Molecular Hyaluronic Acid holds up to 1000x its weight in water, delivering intense hydration across multiple layers of skin. Matrixyl™ 3000 Peptide helps to pump, firm and smooth skin.

HOW IT FEELS: Lightweight and hydrating. No greasiness, stickiness, or tackiness.

WHEN TO USE: AM & PM. Use this moisturising serum right after your cleanse.

Suitable for:

All Skin Types
Sensitive Skin
Pregnancy & Breastfeeding
Teen Approved

Targets:

Fine Lines & Wrinkles
Dehydrated Skin
Damaged Skin Barrier

How to Use

Use AM and PM. On damp, cleansed skin, apply a pea-sized amount to face and neck. Gently pat in.

Follow with

Treatments → moisturizer.

Finish with SPF in your AM routine.

INKEY Tip

Apply to damp skin to lock in hydration.

Also helps other products absorb better—no pilling here.

Heads up

When adding new products to your skincare routine, we always recommend patch testing. Learn more here.

Storage

Store in a cool, dry place (15–25°C). Keep out of direct sunlight. Avoid eyes. For external use only. Keep out of reach of children.

Key Claims

82%

agreed their skin felt firmer, smoother and more elastic after 4 weeks of use**

86%

agreed the serum is quick absorbing, lightweight & non-tacky**

Clinically proven to deliver instant hydration*
Contributes to improved skin barrier by reducing water loss*

*4-week independent clinical study of 22 people under dermatological control

**4-week independent consumer study of 22 people under dermatological control

Ingredients

2% Multi-Molecular Hyaluronic Acid: Hydration powerhouse. This moisture magnet pulls water into the skin and holds it there—helping to keep skin looking plump, smooth, and healthy.
Matrixyl 3000™ Peptide: Targets the look of fine lines and supports firmer-looking skin.

Water (Aqua/Eau), Propanediol, Sodium Hyaluronate, Glycerin, Butylene Glycol, Phenoxyethanol, Ammonium Acryloyldimethyltaurate/Vp Copolymer, Leuconostoc/Radish Root Ferment Filtrate, Hyaluronic Acid, Carbomer, Sodium Lactate, Polysorbate 20, Palmitoyl Tetrapeptide-7, Palmitoyl Tripeptide-1.

FAQs

WHEN TO USE Apply Hyaluronic Acid Serum after cleansing, on damp skin. Wait 30-60 seconds, then follow with other treatments.

WHY FIRST AFTER CLEANSING? This serum absorbs best on damp skin and creates a hydration barrier for products that follow. It also soothes skin and balances pH.

SHOULD I HYDRATE BEFORE A TONER? Yes, it helps the toner and other products absorb better by working deep beneath the skin’s surface.

CAN IT BE USED WITH OTHER PRODUCTS? Yes, it works with everything (including actives like Retinol & AHAs) and enhances the effectiveness of other products.

DO I NEED A MOISTURISER? Hydrators (like Hyaluronic Acid) add water to the skin, while moisturizers lock it in. You may need both, depending on your skin type.

WHO IS IT FOR? All skin types, especially dry or dehydrated skin, and mature skin needing a hydration boost.

IS IT AN AHA? No, it hydrates, not exfoliates.

WHAT % OF HYAURONIC ACID IS THERE %? 2% Multi-Molecular Hyaluronic Acid.

WHAT TYPE OF HYALURONIC ACID? Multi-Molecular, targeting different skin layers for better hydration.

WHAT IS THE PH LEVEL? 6.21

HOW LONG TO SEE RESULTS? Around 6 weeks. Consistency matters—don’t overuse.

IS IT VEGAN? Yes, certified by The Vegan Society.

IS IT SAFE FOR PREGNANT/BREASTFEEDING? Yes.

CAN I USE WITH MEDICATION? Consult your doctor to be sure.

No BS Skincare

From INCI to INKEY: Making the Unknown, Known

Every skincare product has an ingredients list.  We’re here to make it clear. What’s inside. How it works. Why you need it. We reveal the science, the truth, and the best ways to use it. Effective formulas. Straight talk. Real results. Knowledge empowers us.

We are B CORP. Our products are formulated with responsibly sourced ingredients, and packaged with 100% recyclable materials. Skin needs love, but so does our planet.

Carbon Net-Zero. All our emissions are offset annually through planet friendly projects with a focus on education.

Approved under the Cruelty Free International Leaping Bunny programme.

100% of our packaging is recyclable. Learn how to recycle your INKEY List products.

Certified by The Vegan Society

This product is;

Dermalogically tested

Clinically tested

Fragrance-free

Gluten-free

Pregnancy & Breastfeeding safe

Awards & Features

The cult-favourite, hydration serum that hero that kicked off the INKEY obsession

Clinically proven to deliver instant hydration – but it doesn’t stop there clinically proven to plumps, firms, smooths and boost the efficacy of every product you layer on top – and its only €22 - its your overpriced serums worst nightmare.

Instantly hydrates & plumps
Boosts absorption of other products
Lightweight, non-sticky formula. Just €22

Shipping info

Standard EU Tracked Shipping

€5.95**
FREE on your first order & over €45**
(2-5 business days*)

**The following countries are subject to increased Standard Tracked Shipping rates and increased FREE shipping thresholds. In addition, Express Shipping is not available to these countries.

€6.95 - Denmark, Finland, Switzerland, Estonia, Luxembourg - FREE on your first order & over €45
€8.95 - Spain, Portugal, Greece, Sweden, Croatia, Bulgaria, Romania - FREE on your first order & over €55
€11.95 - Malta, Cyprus, Iceland, Serbia, North Macedonia, Bosnia & Herzegovina, Monaco - FREE on your first order & over €65.

Express EU Tracked Shipping

€11.95
(up to 4 business days*, if ordered before 4pm CET on business days)

Tariff or duties

Orders with EU shipping destinations won't be subject to any tariff or duties, however please note that there are a small number of EU and European territories that still require tariffs and duties that will need to be covered by the customer.

*Find out more about shipping here.

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Still not sure?

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"I decided to try Hyaluronic Acid Serum as I'm struggling with acne dry skin from medications. I've been using it for more than a year and my skin is glowing and feels softer than ever! I would definitely recommend this product if you want change your skin for better!"

Katarzyna
"You have been a part of the past 2 years of my skincare journey. Thank you INKEY!"

Keanu
"I’ve used INKEY products religiously and my skin is just amazing! This is before I started and what it is like now. My skin's never been better!"

Adelle
"The INKEY List is the only skincare that's helped my acne-prone skin due to my polycystic ovaries". Lauren has been using Oat Cleansing Balm, Salicylic Acid Cleanser, Hyaluronic Acid Serum, Succinic Acid Treatment and Omega Water Cream since December 2022."

Lauren
"Just wanted to say I’ve been using your brand for just over a month and the products have really helped with my acne and the scarring! They are amazing and the results are incredible."

Amy
"I used the online askINKEY service and chose the Hyaluronic Acid Serum, the Succinic Acid Treatment, and the Omega Water Cream. These are my results after 3 months ❤️ "

Chloe
"Your products have helped me become so much more confident and happy in my skin!"

Tatiana

More Blogs

4.7

Rated 4.7 out of 5 stars

Based on 2,594 reviews

Total 5 star reviews: 2.1k Total 4 star reviews: 382 Total 3 star reviews: 62 Total 2 star reviews: 27 Total 1 star reviews: 40

Reviews Summary

Customers say this serum absorbs quickly and provides excellent hydration without feeling sticky or greasy. Many reviews mention its lightweight texture that works well for various skin types, from oily to sensitive. The serum layers smoothly under other products and leaves skin feeling soft and plump. While some note a slight initial tackiness, most find it disappears when combined with moisturizer. Frequent users appreciate its gentle formula and report consistent results with daily use. Many mention they've purchased multiple bottles and made it a staple in their skincare routine.

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2,594 reviews

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H
Verified Buyer
Reviewing
FREE Hyaluronic Acid Serum 30ml
I recommend this product
Rated 5 out of 5 stars
Yesterday
Simply a staple
As a first layer it is quickly absorbed and gets along with others
Was this helpful?
Alice T.
Verified Buyer
Reviewing
FREE Hyaluronic Acid Serum 60ml
I recommend this product
Rated 5 out of 5 stars
Yesterday
Nice serum for everyday use
I tried the 30ml a year ago, it really helped my skin stay hydrated.
Was this helpful?
Emma S.
Verified Buyer
Reviewing
Hyaluronic Acid Serum - 60ml
I recommend this product
Age Range 45 - 54
Skin Type Dry
Skin Concerns Fine Lines and Wrinkles, Dehydration, Dryness
Sensitive Skin Friendly? Yes
Rated 5 out of 5 stars
Yesterday
Must have
I'm never without this. I repurchase this time after time.
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Supersize Hyaluronic Acid Serum 100ml Duo | The INKEY List

Suitable for:

Targets:

How to Use

Key Claims

Ingredients

FAQs

No BS Skincare

Awards & Features

The cult-favourite, hydration serum that hero that kicked off the INKEY obsession

Shipping info

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Continue shopping

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