Two bottles of The INKEY List Niacinamide Serum on a white background

Close-up of a person applying a product to their eye with text highlighting its benefits. of Niacinamide Serum

Skincare product with text on how to layer Niacinamide Serum in a routine on a neutral background

Cosmetic dropper with sNiacinamide Serum being applied to skin, accompanied by usage instructions.

Before and after comparison of a person's face with acne on the left and clear skin on the right.

Model with Niacinamide Serum on her face

SAVE 5%

Skin /
Serums /
Niacinamide Serum Duo

Niacinamide Serum Duo | The INKEY List

Name: Niacinamide Serum Duo
Brand: The INKEY List UK
SKU: BUNTILUK106
Availability: InStock
Rating: 4.5 (713 reviews)

Power packed duo for reducing excess oil, blemishes and redness

4.5

Rated 4.5 out of 5 stars

4.5 Stars (713 Reviews)

£19.00 ~~£20.00~~ / 2 full-size products

25% OFF 4+ products! Use code PRIME25

Worth 95 Points

What you get: A lightweight, hard-working serum for glowing skin. Powered by Niacinamide for calmer and more even looking complexion.

Why it works: 10% Niacinamide reduces the appearances of excess oil, blemishes and redness. Hyaluronic Acid hydrates and soothes skin.

How it feels: Lightweight and layers easily with skincare, spf and makeup.

When to use: Use AM/PM, after cleansing and applying your hydrator. Follow with moisturiser, and SPF in the AM.

This Duo includes: 2x Niacinamide Serum (30ml)

Suitable for:

All skin types
Sensitive skin
Pregnancy & breastfeeding

Targets:

Excess oil
Redness
Breakouts & blemishes

How to Use

Use in your AM and PM routine. After cleansing and hydrating, apply a pea-sized amount of Niacinamide Serum to face and neck.

Follow with

Moisturiser.

Finish with SPF in your AM routine.

INKEY Tip

Layer from thinnest to thickest formulas, allowing time between each step to help prevent pilling. If your skin is sensitive, apply Niacinamide before Retinol to help reduce potential irritation.

Heads up

Avoid using with high-strength Vitamin C or exfoliating acids (AHAs, BHAs, PHAs). Safe to use with our 15% Vitamin C + EGF Serum.

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

Storage

Keep out of direct sunlight. Avoid eyes. For external use only. Keep out of reach of children.

Ingredients

10% Niacinamide: Reduces the appearances of excess oil, blemishes and redness.
Hyaluronic Acid : Hydrates and plumps skin.

Water (Aqua / Eau), Niacinamide, Glycerin, Propanediol, Butylene Glycol, Phenoxyethanol, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Hydroxyethylcellulose, Phospholipids, Squalane, Xanthan Gum, Glycine Soja (Soybean) Oil, Allantoin, Sodium Phytate, Polysorbate 60, Panthenol, Glycolipids, Leuconostoc/Radish Root Ferment Filtrate, Sorbitan Isostearate, Glycine Soja (Soybean) Sterols, Citric Acid, Hyaluronic Acid, Disodium Phosphate, Sodium Phosphate.

FAQs

CAN I USE THIS IN THE AM OR PM? Both! It’s safe and effective morning and night.

CAN I LAYER IT WITH OTHER ACTIVES? Yes - but avoid using with high-strength Vitamin C (like our 30%) and exfoliating acids (AHAs, BHAs, PHAs). Safe to use with our 15% Vitamin C + EGF.

CAN I USE THIS WITH RETINOL? Absolutely. Apply Niacinamide before Retinol to help reduce potential irritation.

IS IT GOOD FOR DRY SKIN TOO? Yes! It helps balance oil production, making it great for both dry and oily skin types.

WHAT’S THE % OF NIACINAMIDE? 10%

SHOULD I USE THIS OR THE 20% NIACINAMIDE SOLUTION? If you have oily skin all over, go for our 20% Niacinamide. For combination or t-zone oiliness (and no active breakouts), stick with the 10%.

WHAT’S THE PH LEVEL? 6.09 HOW LONG UNTIL I SEE RESULTS? Give it 4–6 weeks of consistent use. More isn’t always better - overuse can cause irritation.

WHY ISN’T THIS PRODUCT VEGAN? It contains one egg-derived ingredient.

IS THE SQUALANE ANIMAL DERIVED? No - it’s plant-based.

IS IT SAFE FOR PREGNANCY OR BREASTFEEDING? Yes

CAN I USE THIS WITH PRESCRIPTION TREATMENTS? Check with your doctor first.

No BS Skincare

Skincare can be confusing.

So we cut the BS, and get straight to the point. We simplify the INCI list - commonly known as the ingredients list, that every skincare product has. That’s also where we get our name from. We’re The INKEY List - here to help you get better skin with real knowledge and formulas that deliver. No BS. No hype. Just effective, science-backed skincare that does what it says it will. We show you what your skin needs, not what’s trending. Whether you’re new to skincare or have a solid routine, we’ve always got your back with innovation, education and clinically-proven results.

All at a price that makes sense.

INKEY. No BS, just better skin.

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.

This product is;

Fragrance-free

Gluten-free

Pregnancy & Breastfeeding safe

Awards & Features

Delivery info

Standard tracked delivery (Evri)

£3.99 or FREE on your first order & orders over £30
(2-5 working days*)

Express tracked delivery (Evri)

£5.95 or FREE on orders £50+
(Up to 2 working days if ordered before 8pm, excluding weekends*)

*Find out more about delivery options and delivery area restrictions here.

Track the status of your parcel with
our trusted couriers

Still not sure?

Take our Skin Quiz, choose your personalised routine and get FREE products.

Take The Quiz

More Blogs

20% OFF sets! Limited time only.

Zaklina uses Fulvic Acid Cleanser with Niacinamide Serum, Tranexamic Acid Serum and Vitamin BCE Moisturiser. “You took my skin (and face) to another level! Thank you INKEY List.”

Zaklina
"This is after just a couple of months using The INKEY List... I couldn't not show you. I had tried everything before and nothing ever helped!"

Tina C
Aysu started using Niacinamide Serum in her routine to improve her skin. After 2 months of use, her redness and breakouts have reduced.

Aysu
Mia is a loyal INKEY customer, using Salicylic Acid Cleanser in her routine along with Succinic Acid Treatment, Mandelic Acid Treatment, Retinol Serum and Niacinamide Serum.

Mia M
Shannon shared her myINKEY skin journey with her TikTok followers. She used Omega Water Cream AM and PM to improve her skin barrier, alongside Beta Hydroxy Acid Serum, Niacinamide Serum, Salicylic Acid Cleanser and Succinic Acid Treatment to tackle her breakouts.

Shannon

4.5

Rated 4.5 out of 5 stars

Based on 713 reviews

Total 5 star reviews: 514 Total 4 star reviews: 124 Total 3 star reviews: 39 Total 2 star reviews: 12 Total 1 star reviews: 24

Reviews Summary

Customers say this serum has a light, silky texture that absorbs well into the skin. Many reviews mention reduced oiliness, especially in the T-zone area. Users note improvements in skin texture and appearance of pores. The serum receives praise for its gentle formula, with several mentioning they've been repeat purchasers for years. While most find it effective, some note recent formula changes affecting texture and absorption. Common feedback includes its effectiveness for combination skin types and easy incorporation into daily routines. Reviews particularly highlight its soothing properties when used before other products.

Write a Review (Opens in a new window)

713 reviews

Sort

Matic K.
Verified Buyer
Reviewing
Niacinamide Serum
Age Range 25 - 34
Skin Type Oily
Skin Concerns Breakouts, Oiliness, Blackheads, Under Eye Circles, Texture
Rated 3 out of 5 stars
1 week ago
So far, no results
So far, no results. will see how it if after another month of usage
Was this helpful?
Libby
Verified Reviewer
Reviewing
Niacinamide Serum
I recommend this product
Age Range 18 - 24
Skin Type Combination
Skin Concerns Redness, Texture
Sensitive Skin Friendly? Yes
Rated 5 out of 5 stars
2 weeks ago
Super effective & lightweight!
Great for my sensitive skin- other niacinamide serums I've tried have had added products that irritated my skin, but this was perfect. No weird residue left and is super lightweight and feels great on the skin. Saw results after 2-3 days of use.
Was this helpful?
Emily A.
Verified Buyer
Reviewing
Niacinamide Serum Duo
I recommend this product
Rated 5 out of 5 stars
2 weeks ago
Trusty
Trusty & reliable.
Was this helpful?

Continue shopping

Skincare Sets NEW Exosome Hydro-Glow Complex Moisturisers

Niacinamide Serum Duo | The INKEY List

Suitable for:

Targets:

How to Use

Ingredients

FAQs

No BS Skincare

Awards & Features

Delivery info

Salicylic Acid Cleanser - 150ml

Omega Water Cream - 50ml

360° Skin Clearing Serum

Beta Hydroxy Acid (BHA) Serum

Blackhead Routine

Intro Routine

Still not sure?

How to Layer Skincare

Oily Skin 101

Acne 101

Continue shopping

About

Privacy & Terms

Knowledge

Follow Us

Rewards

Where are you Shopping?

Niacinamide Serum Duo | The INKEY List

Suitable for:

Targets:

How to Use

Ingredients

FAQs

No BS Skincare

Awards & Features

Delivery info

Salicylic Acid Cleanser - 150ml

Omega Water Cream - 50ml

360° Skin Clearing Serum

Beta Hydroxy Acid (BHA) Serum

Blackhead Routine

Intro Routine

Still not sure?

How to Layer Skincare

Oily Skin 101

Acne 101

Continue shopping

Sign into your account