Ingredient Callouts: It comes in recyclable packaging.
What Else You Need to Know: This serum is formulated with just 10 ingredients to absorb excess oil and minimize the look of redness. It is free of fragrance and colorants and is minimally formulated for skin absorption and efficacy.
Clinical Results: In a consumer 4-week study, after 1 week: - 92% agree skin feels soothed
After consistent use, I noticed my skin looked calmer and less oily throughout the day. It also helped smooth some texture and made my skin feel more balanced overall. I appreciate that the formula is fragrance-free and gentle because my skin can be sensitive at times.
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athenameiji
Combination skin
9mos ago
Recommended
Honestly this paired with a little red light before sign significant difference within my scarring 
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abbyyyy1
Combination skin
11mos ago
Recommended
A must-have in my routine
I damaged my skin barrier and this serum saved me! I have sensitive skin and this has become a staple in my skincare routine.
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Dair96
1yr ago
0 noticeable differences
I used the whole bottle. I didn’t notice any significant difference…
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Kodenn
Brown eyes, Not Sure skin tone, Normal skin
Verified Purchase
1yr ago
Unremarkable but not terrible
My dermatologist recommended I use niacinamide to help reduce redness, and I've been using The Ordinary's 10% formulation for years which works pretty well. I decided to give Kiehl's version a try because I read online that 5% is actually a better formulation since too much niacinamide is bad for the skin and it's included in many products (including my lotion).
This product is OK. It's a much more runny and stickier formulation than The Ordinary's. The instructions say to use 4-5 drops; honest, I think 3 is more than enough unless you have 5-10 minutes in the morning to wait for this to absorb. After 2 months, I haven't noticed a real difference to my skin. After I finish up this bottle, I'm going back to The Ordinary seeing as it does the same thing for a much lower price.
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texasgirl8
Brown eyes, Combination skin
1yr ago
Recommended
A must for oil control
This is one the best oil control products I’ve used and I have very oily skin this with a good moisturizer and Kiehl’s Milk Peel gets my skin right
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DrKiehl
Brown eyes, Deep skin tone, Oily skin
1yr ago
Recommended
Like it
Best niacinamide serum, high quality with lovely results
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umadam
Combination skin
1yr ago
meh, disappointment
overpriced for lack of results. non greasy, non -fragrance
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lizsid
Blue eyes, Medium skin tone, Normal skin
Verified Purchase
1yr ago
Recommended
Wasn’t KIEHLS fan until this product
A must buy for me.
Evens out skin texture (got numerous compliments).
Doesn’t irritate my sensitive skin.
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Maryanton
Light Medium skin tone, Combination skin
1yr ago
Recommended
Holy Grail
I picked up this bottle a little over two weeks ago and I can confidently say this is something that will stay in my routine forever. It works so well and quickly, and unlike other acne products I’ve tried this doesn’t make my skin peel as it's cleaning my skin. And a little goes a long way so it's a bang for your buck. 15/10 product!!!
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ArielBooker
What it is: A concentrated facial serum formulated with just 10 ingredients to absorb oil and minimize the look of redness.
Skin Type: Normal, Dry, Combination, and Oily
Skincare Concerns: Redness, Uneven Texture, and Oiliness
Ingredient Callouts: It comes in recyclable packaging.
What Else You Need to Know: This serum is formulated with just 10 ingredients to absorb excess oil and minimize the look of redness. It is free of fragrance and colorants and is minimally formulated for skin absorption and efficacy.
Clinical Results: In a consumer 4-week study, after 1 week: - 92% agree skin feels soothed
Suggested Usage: -In the morning and evening, apply two to three drops to clean, dry skin.
Try out Kiehl’s Since 1851’s skin hacks: -Zone treat your face by applying Ultra Pure High-Potency 5.0% Niacinamide Serum to areas prone to oiliness and breakouts, then follow with your favorite moisturizer where needed. -Layer with Kiehl’s Since 1851’s Ultra Pure Hyaluronic Acid 1.5% Serum (sold separately) to hydrate and nourish skin. -Layer with Kiehl’s Since 1851’s Ultra Pure High-Potency 9.8% Glycolic Acid Serum (sold separately) to gently exfoliate and visibly improve texture.
Summary
5
4
3
2
1
4.4★
91 Reviews*
86%
Recommended
*Some reviewers received something in exchange for a review (free product, payment, sweeps entry).
