20% Niacinamide Serum
How to layer Excess Oil Solution in your routine
Key claim from clinical study of using 20% Niacinamide serum
before & after of using 20% Niacinamide Serum
Excess Oil Solution tube and outer packaging on a black shelf against blue gradient background with goop

20% Niacinamide Serum | The INKEY List

20% Niacinamide to help balance excess oil, improve skin texture and reduce the appearance of pore size.

4.2
Rated 4.2 out of 5 stars
4.2 Stars (299 Reviews)
$19.50 / 30ml

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A lightweight, non-sticky serum formulated with 20% Niacinamide to balance excess oil, improve skin texture and decrease the appearance of enlarged pores.

Created in partnership with dermatologists, this formula contains our highest % of Niacinamide, which helps reduce excess oil production throughout the day and effectively tighten the look of enlarged pores. Other key ingredients include; Zinc PCA which targets sebum build up and Squalane to protect the skin's barrier.

Suitable for:

  • Oily Skin
  • Pregnancy & Breastfeeding

Targets:

  • Excess Oil All Over The Face
  • Acne & Blemishes
  • Enlarged Pores

Proud to be:

  • Carbon Net-Zero
  • B-Corp
  • Cruelty Free
  • Recyclable
  • Vegan
  • Clinically Tested
  • Dermatologically Tested
  • Travel Size
  • Gluten Free
  • Fragrance Free
  • Clinically proven to control oil for 8 hours.*

    *DISCLAIMER: Independent clinical study of 20 people.

  • Immediately reduces excess oil by up to 60%.*

    *DISCLAIMER: Independent clinical study of 20 people.

  • 92% agreed pores looked and feel smoother after 3 days.*

    *DISCLAIMER: 4 week independent consumer trial of 50 people with oily skin.

  • 91% agreed the serum improved the texture and evenness of their skin after 3 days.*

    *DISCLAIMER: 4 week independent consumer trial of 50 people with oily skin.

  • 92% agreed skin felt fresh, balanced and less shiny after 3 days.*

    *DISCLAIMER: 4 week independent consumer trial of 50 people with oily skin.

Shipping info

Standard tracked shipping

  • $5.95 or FREE on your first order & orders over $35
  • (2-5 business days*)

Express tracked shipping

  • $15
  • (2-3 business days*, when ordered before 3pm EST)

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SHOULD I BE USING EXCESS OIL SOLUTION?

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Supersolution

20% Niacinamide Serum

20% Niacinamide Serum

20% Niacinamide Serum

Suitable for...

People who have excess oil, all over the face rather than just in the t-zone, causing oil related concerns such as enlarged, visible pores and textured skin​.

$19.50 / 30ml

or

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Niacinamide Serum

Niacinamide Serum

Suitable for...

People who have combination skin or t-zone oiliness, or do not have active acne or breakouts.

$10.50 / 30ml

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4.2
Rated 4.2 out of 5 stars
Based on 299 reviews
Total 5 star reviews: 158 Total 4 star reviews: 77 Total 3 star reviews: 39 Total 2 star reviews: 13 Total 1 star reviews: 12
Reviews Summary
Customers say this serum helps manage oily skin throughout the day. Many reviews mention reduced shine, especially in the T-zone area. While some note a white residue when applying, most find it works well under makeup. Reviews are mixed on pore appearance, with some reporting visible improvements while others see minimal change. Common feedback includes the need to shake well before use and concerns about packaging design. Users with combination skin particularly appreciate its targeted application for oily areas.
299 reviews
  • Heidi K.
    Verified Buyer
    I recommend this product
    Age Range 55 - 64
    Skin Type Oily
    Skin Concerns Oiliness, Breakouts
    Sensitive Skin Friendly? Yes
    Rated 5 out of 5 stars
    1 week ago
    This stuff works!

    I have struggled with oily skin my entire life. At 57 years of age, I’m thrilled to finally have a product that greatly reduces oiliness and shine but still leaves my skin soft and dewy. This is a game changer!

  • Chamoosing K.
    Verified Reviewer
    I recommend this product
    Age Range 25 - 34
    Skin Type Combination
    Skin Concerns Acne Scars, Blackheads, Hyperpigmentation, Breakouts
    Sensitive Skin Friendly? Yes
    Rated 5 out of 5 stars
    2 weeks ago
    Blemishes gone...

    Been using this serum for 2 weeks, all me blemishes are gone, will be repurchasing :)

  • Molly C.
    Verified Reviewer
    I do not recommend this product
    Age Range 25 - 34
    Skin Type Oily
    Skin Concerns Breakouts, Fine Lines and Wrinkles, Blackheads, Hyperpigmentation, Texture
    Sensitive Skin Friendly? No
    Rated 1 out of 5 stars
    3 weeks ago
    I basically can't use this

    Don't usually write reviews for products but sadly this was such a waste of money. I was so excited about this as I have super oily skin, but no matter how many ways I try and use it, it leaves a white cast which then just flakes off and leaves rubbish all over your face. Not worth it!

    IU Profile picture for INKEY USA
    INKEY USA
    1 week ago

    Thank you so much for taking the time to share your detailed feedback, Molly.

    We're truly sorry to hear about your experience with this one. This is absolutely not the experience we want any of our customers to have. While many customers use our serum without issue, we understand that everyone's skin can react differently to niacinamide formulations, and application results can vary greatly from person to person. The white cast and flaking issues you've described are particularly valuable feedback for us. We recognise how frustrating and disappointing it must be when a product you were excited to try doesn't work as expected, especially when you've tried multiple application methods. Please do reach out to our askINKEY Team if we can support you further with your experience 🖤