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Summary
Conscious Beauty at Ulta Beauty™
- Clean Ingredients
- Sustainable Packaging Brand
The Niacinamide 15 Serum with Acetyl Glucosamine + Zinc PCA from COSRX is a highly concentrated serum that combines the maximum concentration of niacinamide with optimal ratios of synergistic ingredients for total acne control.
Benefits
- Niacinamide : Provides total acne care by controlling sebum production, soothing acne inflammation and diminishing post acne scars
- N-Acetylglucosamine (NAG) : Works in synergy with niacinamide to effectively fade hyperpigmentation
- Zinc PCA : Inhibits inflammation and promotes recovery of damaged skin
- Allantoin : Promotes collagen synthesis to facilitate skin regeneration
After cleansing, during the serum phase, apply a few drops to the skin. Use fingertips to gently massage and absorb the serum, starting from the center of the face working towards the edges. Highly concentrated serums should only be used in the evening? NO! This serum can be used in the morning and/or night. If applied in the morning, be sure to use with a SPF of 30 or higher.<
Water, Pentylene Glycol, Niacinamide(15%), Butylene Glycol, Acetyl Glucosamine, 1,2-hexanediol, Zinc Pca, Trehalose, Xanthan Gum, Pullulan, Allantoin, Ethylhexylglycerin, Sodium Phytate, Citric Acid, Tocopherol.
This brand is excluded from most Ulta Beauty coupons.
Free gift with purchase
Free gift with purchase
Online only free moisturizing lotion with $35 CosRx purchase (valid thru 5/17/25 on shipped purchases only. Full or partial pickup or same day delivery purchases do not qualify. While quantities last)
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Questions
Ask a QuestionQ&A
Showing 5 out of 15 Questions
- Q
Can I use this if I use tret every night on my face
- Asked by Rae
- Official Answer By COSRX - Brand EngageIt's important to introduce new products gradually and monitor your skin's response. We recommend applying the niacinamide serum in the morning and using tretinoin at night, allowing your skin to adjust to both ingredients. If you experience any irritation, consider spacing out their usage or consulting with a dermatologist for personalized advice.Was this answer helpful to you
- Q
There is a clear liquid and then cloudy, chunky, balls that don't disintegrate. Is that what it's supposed to look like? Also the dropper is terrible and theres not much coming out
- Asked by Kristie
- Official Answer By COSRX - Brand EngageDue to the high concentration of active ingredients, the formula may sometimes clump. This is not a defect—simply remove any clumps before use.Was this answer helpful to you
- Q
Hi I'm using the REN toner for brightening dark spots. Is it okay to use this with that? Ingredients Aqua (Water), Sodium Lactate, Lactic Acid, Heptyl Glucoside, Potassium Azeloyl Diglycinate, Triethyl Citrate, Glyceryl Caprylate, Salix Nigra (Willow) Bark Extract, Benzoic Acid, Citrus Nobilis (Mandarin) Peel Oil, Citrus Aurantium Dulcis (Orange) Flower Oil, Citrus Grandis (Grapefruit) Peel Oil, Citrus Tangerina (Tangerine) Peel Oil, Heptanol, Parfum* (Fragrance), Limonene
- Asked by Katie
- Official Answer By COSRX - Brand EngageHi! Unfortunately, we can't provide information using with other brands.Was this answer helpful to you
- Q
Can I use the glycolic acid exfoliating toner with this product together ?
- Asked by katie
- Official Answer By COSRX - Brand EngageBoth products can be used together, but we recommend performing a patch test first and monitoring the reaction before regular use.Was this answer helpful to you
- Q
How high is the niacinamide percentage?
- Asked by C
- Official Answer By COSRX - Brand EngageThe product contains 15% of niacinamide.Was this answer helpful to you
Reviews
Write A REVIEWReview Snapshot
by PowerReviews
Ratings Distribution
Skin Type
- 2Oily
- 1Combination
Most Helpful Positive Review
Magic rednesss/acne/pore eraser for my fair skin!
I am in LOVE with this serum. It just works like straight up magic on my face and addresses so many things all at once with absolutely zero irritation at all. I have fair-light combination skin that, thanks to my irish ancestors, makes any blemish and any leftover healing spots a bright red glaringl...
Most Helpful Critical Review
It's an okay serum
Received for free courtesy of influenster and cosrx for my honest review. The packaging of the rx line is super simplistic and minimalistic, like the black/white look. This bottle was short and round. The Niacinamide 15 is a concentrated serum that has 15% Niacinamide. The serum is nice. Its almost ...
606 results
Drastically improved smile lines & redness
I've had smile lines on my left side that just stayed constantly creased for about the past 1.5 years—but now after using my first full bottle of this, they're almost totally gone! I've also been dealing with what seems to be perioral dermatitis (red blotchiness & occasional bumpy breakouts on smile lines & under nose; still in the process of figuring this out with my dermatologist)—& this is almost entirely gone too! I've tried so many different products, including prescriptions, and this is the first thing that has actually done the trick for both issues. Both issues do seem to resurface slightly if stop using this one for a few days, but never look as severe as before.
Good serum BUT terrible packaging
The serum itself is nice, didnt irritate my skin (i have sensitive skin). But the packaging is horrible. First, its quite small for what we pay for. Second, the suction tube doesn't take up much or release enough of the serum. There's a bit thats stuck, no matter how many times i try to squeeze it out, its still there. You have to squeeze at least twice to get a good amount for face and neck. The packaging is the only reason I wouldn't buy again. I hope they upgrade.
Doesn't do anything
Didnt help my skin. Waste of money
So far enjoying itka
i do enjoy this product. It has a really nice lumious finish once applied and makes my skin look lush once my routine is done. I havent used it long enough to see my pores get to where i want them but it seems like its helping my nose pores stay less congested!
Love this and can't be without!
I am 76 years young and about a year ago, my skin suddenly developed milia on my upper lip and chin. I was using a sonic facial brush, PTR 2% salicylic acid pads and LaRoche Posay 2% sallicylic acid face cleanser! No matter what I did, those little white bumps showed up every day, driving me to express them before washing my face. When I saw this product, I thought "maybe?" Well, it is indeed a miracle worker! No more milia, pores looking smaller on my nose - just rosy, healthy skin. I never had shiny, oily skin - just very over-productive oil glands in certain areas. This is great because it lessens any red marks (I also have Rosacea) and doesn't dry out the non-problem areas of my face. I absolutely recommend - regardless of your age!
