• Cosrx The Niacinamide 15 Serum Pore Refining & Oil Control
  • Cosrx The Niacinamide 15 Serum Pore Refining & Oil Control
  • Cosrx The Niacinamide 15 Serum Pore Refining & Oil Control
  • Cosrx The Niacinamide 15 Serum Pore Refining & Oil Control
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Cosrx

Cosrx The Niacinamide 15 Serum 20ml Pore Refining & Oil Control

Cosrx The Niacinamide 15 Serum 20ml Pore Refining & Oil Control

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Description

COSRX The Niacinamide 15 Serum 20ml – Pore Refining & Oil Control

Discover a more refined, balanced complexion with COSRX The Niacinamide 15 Serum, a concentrated Korean skincare treatment created for persistent shine, noticeable pores and blemish marks. Its 15% niacinamide formula helps regulate excess surface oil while supporting a clearer, smoother appearance.

What makes this serum especially appealing is its thoughtful combination of niacinamide, Zinc PCA and Acetyl Glucosamine. Together, they address oiliness and uneven tone, while soothing and moisture supporting ingredients keep the experience comfortable. Enjoy free shipping from Everything Keratin.

Product benefits

  • Balanced oil production: Includes 15% niacinamide and Zinc PCA to help reduce excess sebum and unwanted facial shine.
  • Refined looking pores: Includes niacinamide to make enlarged pores appear less noticeable as oiliness becomes better controlled.
  • More even complexion: Includes Acetyl Glucosamine alongside niacinamide to help improve the appearance of dark marks left after blemishes.
  • Smoother skin texture: Includes the targeted niacinamide formula to improve the look of rough, uneven skin with consistent use.
  • Comfortable hydration: Includes Trehalose and moisture attracting glycols to support softness without a heavy finish.
  • Calmer feeling skin: Includes Allantoin to help soothe and condition skin during a focused oil control routine.
  • Antioxidant care: Includes Tocopherol, a form of vitamin E, for additional skin conditioning support.

What makes this product different?

Rather than relying on niacinamide alone, COSRX pairs a substantial 15% concentration with Zinc PCA for oil prone areas and Acetyl Glucosamine for the appearance of lingering pigmentation. This gives the serum a distinct purpose: helping oily or combination skin look less shiny, more even and visibly refined. Its non-comedogenic tested formula is another advantage.

Does this suit me?

It's best for:

  • Oily skin that develops noticeable shine throughout the day
  • Combination skin with a greasy T-zone and visible pores
  • Blemish prone skin with lingering post blemish marks
  • Uneven skin tone that needs a more uniform appearance
  • Rough looking texture associated with excess surface oil
  • Experienced niacinamide users seeking a stronger targeted serum

Professional treatment compatibility

For professional facials, this serum may fit into a routine focused on oily skin, visible pores and uneven tone when the skin barrier is intact. It can be considered after gentle cleansing and before moisturiser. Avoid applying immediately after microneedling, strong chemical peels, laser resurfacing or other procedures that leave skin compromised. Resume only when the treating professional confirms that active skincare is appropriate.

How to apply with foundation or makeup

After cleansing and toning, apply a small amount and allow it to settle before moisturiser. In the morning, finish skincare with broad spectrum SPF 30 or higher before applying foundation.

If makeup rolls or pills, use fewer drops, allow each layer to absorb and avoid rubbing repeatedly over the same area.

Frequently asked questions

Is this better than a 5% or 10% niacinamide serum?

Choose this 15% option when oil control and pore appearance are priorities and your skin already tolerates niacinamide well. Lower strengths may be preferable for beginners or easily irritated skin; more concentrated does not always mean more effective.

Can I apply it only to my nose and forehead?

Yes. If your main concern is shine in the T-zone, apply a thin layer to those areas rather than treating your entire face unnecessarily.

Will it physically shrink my pores?

No serum permanently changes pore size. By helping manage oil and improve the surrounding skin's appearance, this formula can make pores look less prominent.

How quickly should I expect results?

A less greasy finish may be noticed sooner, while improvements in uneven tone and post blemish marks generally require consistent use over several weeks.

Can I use it with vitamin C, retinol or exfoliating acids?

These ingredients can coexist in a skincare routine, but combining several strong products at once can increase irritation. Introduce them separately and alternate applications if needed.

What do customers say about the texture?

Published reviews often praise quick absorption and a less oily feel, although some users mention tingling or pilling.

Is this a spot treatment for active pimples?

It is best understood as a leave on serum for oil balance, visible pores and the appearance of marks after blemishes. It is not a replacement for a dedicated acne medicine or a treatment for severe, inflamed breakouts.

How to use

Steps

  1. If the product has a safety seal, check that it is intact before opening.
  2. Cleanse and tone your face, then apply a few drops of COSRX The Niacinamide 15 Serum to dry or slightly damp skin.
  3. Gently massage with your fingertips from the centre of your face outwards until absorbed. Avoid the eye area.
  4. Follow with moisturiser and apply broad spectrum SPF 30 or higher in the morning.
  5. Because this serum contains 15% niacinamide, start two or three times a week and increase gradually if your skin remains comfortable. Reduce use if redness, stinging or dryness develops.

Professional tip

A higher niacinamide concentration does not necessarily produce better results. If you also use retinol, vitamin C or exfoliating acids, introduce products separately and consider alternating strong treatments to limit irritation. Consistent use and daily sunscreen are especially important when targeting uneven tone and post-blemish marks.

Ingredients

Main ingredients

Water, Pentylene Glycol, Butylene Glycol, 1,2-Hexanediol, Xanthan Gum, Pullulan, Ethylhexylglycerin, Sodium Phytate, Citric Acid

Key ingredients

Niacinamide (15%), Acetyl Glucosamine, Zinc PCA, Trehalose, Allantoin, Tocopherol

How do the key ingredients function in COSRX The Niacinamide 15 Serum Pore Refining & Oil Control?

  • Niacinamide (15%): A concentrated form of vitamin B3 that helps manage excess oil, reduce the appearance of enlarged pores and gradually improve the look of dark marks left by blemishes. It also supports the skin barrier. As 15% is a relatively high concentration, sensitive skin may need time to adjust.
  • Acetyl Glucosamine: Complements niacinamide by helping improve uneven skin tone and the appearance of lingering pigmentation, revealing a clearer and more uniform complexion.
  • Zinc PCA: Helps manage excess sebum and surface shine while supporting moisture balance. It is especially useful for oily skin and areas such as the forehead, nose and chin.
  • Trehalose: Attracts moisture to help keep skin hydrated and comfortable, balancing the formula's focus on oil control.
  • Allantoin: Soothes skin and helps ease feelings of dryness or discomfort, adding a calming element to this concentrated treatment.
  • Tocopherol (Vitamin E): Provides antioxidant and skin conditioning support, helping maintain a soft and healthy looking complexion.

Why are customers choosing COSRX The Niacinamide 15 Serum Pore Refining & Oil Control over other niacinamide serums?

COSRX The Niacinamide 15 Serum offers a targeted approach to clearer, smoother and more balanced skin. Its impressive 15% niacinamide concentration is complemented by Zinc PCA to help control excess oil and minimise the appearance of pores, while acetyl glucosamine supports a more even skin tone and helps improve the look of post blemish marks. This combination makes it especially appealing to customers managing shine, visible pores and uneven complexion at the same time. Its lightweight texture absorbs quickly and layers comfortably beneath moisturiser without leaving a heavy finish.

Customer feedback frequently highlights the serum's comfortable texture, reduced surface shine and improvements in the appearance of pores and uneven skin tone with consistent use. Some users experience dryness or tingling, particularly when introducing a stronger niacinamide formula. What distinguishes this serum is its focused blend of ingredients rather than concentration alone. For customers whose skin tolerates stronger actives, it delivers a purposeful daily treatment for a fresher, more refined and beautifully balanced complexion - Everything Keratin

Specifications

Product name:
COSRX The Niacinamide 15 Serum Pore Refining & Oil Control

Brand:
COSRX

Product type:
Concentrated niacinamide facial serum

Size:
20ml / 0.67 fl. oz.

Country of origin:
South Korea

Texture and finish:
Lightweight, refreshing liquid serum designed to absorb quickly without a heavy residue

Treatment focus:
Excess sebum, visible pores, uneven texture, blemish prone skin and the appearance of post blemish pigmentation

Key ingredients:
Niacinamide 15%, Acetyl Glucosamine, Zinc PCA, Trehalose, Allantoin, Tocopherol

Other formulation components:
Water, Pentylene Glycol and Butylene Glycol form part of the lightweight serum base; Xanthan Gum and Pullulan contribute to texture

Skin types:
Especially suited to oily and combination skin; blemish prone skin when tolerated. Dry or sensitive skin may require extra caution

Application areas:
Face, or selected areas such as the forehead, nose and chin; avoid the eye area

Preparation:
Check any safety seal before first use. Cleanse and tone skin before applying

Application:
Apply a few drops during the serum stage and gently spread from the centre of the face outwards. Follow with moisturiser

Processing time:
Leave on; allow to absorb before the next skincare layer

Frequency:
Suitable for morning or evening according to manufacturer directions. Begin two or three times weekly if new to high strength niacinamide, increasing only as tolerated

Removal:
No rinsing required; remove during the next regular cleanse

Professional and home use:
Suitable for personal skincare and professional facial routines on intact skin, subject to individual tolerance and treatment protocols

Daytime protection:
Apply broad spectrum SPF 30 or higher during the day

Storage:
Keep tightly closed in a cool, dry place away from direct sunlight and excessive heat; follow packaging instructions

Cautions:
External use only. Patch test before first use. Avoid eyes, broken or irritated skin. Discontinue if persistent burning, swelling or irritation occurs. Seek professional advice before resuming after invasive treatments

Important formulation disclosure:
Contains 15% niacinamide, a relatively high concentration that may cause stinging, redness or dryness in reactive skin. COSRX identifies the formula as non-comedogenic tested; this does not guarantee that every individual will remain breakout free. The serum is not an exfoliating acid treatment, and cosmetic pore refinement should not be confused with permanently reducing pore size. Verify the ingredient list on the product received if sensitivities are a concern.

Delivery + Returns

  • Shipping cost: Free shipping and no minimum spend
  • Delivery time: 3 to 7 days if shipped within Australia. Up to 2 weeks for international. Delivery timeframe depends on the product you order.
  • Shipping destinations: NZ, USA, CAN, UK and all other major hubs
  • Handling time: 2 to 3 business days 
  • Hours of operation: Monday to Friday, 8:30am to 5pm AEST

FAQ

Do you offer free shipping on all products? 

Yep! We offer free standard shipping on all domestic and international orders. No hidden fees, no nasty surprises at checkout. Excellent for time-poor customers.

What is the return policy?

We have a 30 day return policy. To request a return, please contact us within 5 days of receiving your order by emailing info@everythingkeratin.com.

If your item arrives damaged, please include photos of the product received, its packaging and the shipping label when contacting us. These photos are required to assess and process damaged-item refund claims as quickly as possible.

Do you ship to PO BOX addresses?

No. For secure delivery, our courier requires a recipient to be present at the delivery address to sign for the package. Deliveries cannot be made to unattended addresses where it's a PO Box address.

What’s the 60 day money back guarantee?

Get the item you ordered or your money back within 60 days. We understand that unexpected shipping delays, customs processing, faulty items and other transit-related issues can occasionally occur and may be outside of your control.

 

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