body{margin-left:12%}Product ReviewsRated 4.6 out of 5 stars530 ReviewsMost Helpful Positive ReviewOil controlThis also was for oily skin. Seems to be working wellMost Helpful Critical ReviewHigh-potency serum for oily minimizingAs a person with a regular skin care routine, I had high hopes for the serum I received due to having success with their other products. However, I was less impressed with this one and my skin seems to be sensitive towards it. While it's for oil minimizing, I'm not sure if the intentions are to dry out the skin completely before using a moisturizer or not. Or maybe it was my moisturizer, but there seemed to be little to no change in terms of reducing oil. I did enjoy however how tight and firm it made my face look. Despite the oil minimizing being minimal, maybe other skin types will have better success.Reviewed by 530 customersLove it!5Alondra Torres from Huntsville, ALI love this product, my skin texture has improve tremendously. I cannot go without it.AMAZING5Mel0001 from undisclosedI've noticed reduced pore size, clearer skin and my dark spots are fading slowly. It's even helping with my oil production.Not much serum1Overpriced from NyNot a lot of product…. Cant begin to explain how dissatisfied I am. They need to include a disclaimer indicating it's minuscule size 🙄Awesome drops5Singlah from Va Bch, VaI always used Skin Ceutical but the products can be expensive. So I switched this drops to give a try and cost much cheaper. It works so far on my skin for two weeks now. . No more redness and less pigmentations and brighter up my skin.. Thanks.Good so far4Erosp from undisclosedFelt like it's helped refresh my facial skin. A little goes a long way tooGo to daily serum5Scott m from undisclosedOn my second bottle using twice a day and my skin looks noticeably healthier and less oily since starting this serum. Will keep this a part of my daily skin routine. Its a bit sticky but that doesn't bother me much as it fades away after a while.Good stuff5Jayhawk Bowler from undisclosedI thought this stuff was a little pricey, so I decided to try a different brand. I have oily skin and this stuff helped but didn't completely help the problem. The other brands don't compare to this. My face was soaked in oil when I tried something different. This stuff is the real deal. Not perfect, but helps a lot more than others.Fragile1MorganAngus from Higgins Lake, MIThis review is related to the packaging: I ordered the Serum and used it a couple nights before it I baubled it and it fell off my sink and the glass smashed all over my tile floor. If I order again, my plan is to wrap it in electrical tape in case it slips again, but it shouldn't be like this.Perfect even on sensitive skin5Gaia from ChicagoI'm on my third bottle. This pairs well with Tretinoin. The serum is light and works well on sensitive skin.Easy to use5breannal42 from undisclosedI was pleasantly surprised with this little bottle. It is a liquid formula but once it goes on the skin I instantly feel like it plumps up my skin. It leaves my skin sticky to the touch but not in an uncomfortable way. Great addition to skincare routine. No smell and left with no redness or irritation.My Skin Loves It!5Jing W from South DakotaHonestly, I don't know why I like this product. I simply love it because my skin looks beautiful after I use it. I don't think I want to ever stop using it (as long as the ingredients don't change).My favorite product5catfat from undisclosedWow, I see a difference only after using a week. I have somewhat sensitive combo skin with large pores and some redness. I've never been more impressed by and happy with a skincare product. I will never be without this! Has also toned down my significant facial redness.Great for skin4beautyjunkiereviews from undisclosedMy skin tends to run more oily and is uneven in a little texture and in color. While using this serum I get les oil production visibly on my face through out the day. I also think my skin texture and tone has started to really even out with consistent use of this product.Combats oil production!5eriscancreatekaos from undisclosedI am so glad I received this product as a gift for review, it works wonders on my oily skin. The Niacinamide brightens and combats oil effortlessly and is not tacky after using. It works well with my other skincare and does not pill up. If you want to tackle your oil, this is for you!Light-weight serum4momo0101 from undisclosedThis serum has a lightweight texture that absorbs quickly into the skin. It contains 5% niacinamide, which helps to reduce the appearance of pores and improve skin texture and tone. After using this serum for a month, I have noticed my skin appeared smoother and more radiantShow your oily skin who's boss👊5americantravelfamily from undisclosedHold onto your hats, skincare enthusiasts, because Kiehl's Ultra Pure High Potency 5% Niacinamide Serum is here to show oily skin who's boss! Minimalist in design but maximalist in impact, this little vial of wonder is like the Marie Kondo of serums—it tidies up your face with only 10 ingredients, sparking nothing but joy. Let's talk Niacinamide. At a robust 5%, this serum isn't playing games. From the first drop, you can feel it orchestrating a skincare symphony aimed at balancing your oil levels. Within days, my T-zone stopped looking like an oil slick and started resembling something more celestial—dewy, but not greasy. Did I mention the 'excess oil and shine' reducing superpowers? If this serum were a superhero, it'd wear a cape made of mattifying rice paper. It zaps shine so effectively, you might just find yourself saying, "Mirror, mirror on the wall, who's the least shiny of them all?" So if you've got oily skin and you're looking for that potion to tip the scales toward balanced, look no further. This serum is the high-potency sidekick your skincare routine didn't know it needed.I Wanted To Love It2Ton14 from TexasI brought the 5.0% Niacinamide Serum with high hopes that it will help clear up my blemishes from acne scars, after using the whole bottle, nothing drastically changed. This made me disappointed I really wanted to add this to my face regiment!Brightens and evens skin tone5B Burk from PhoenixOver the years I have tried a lot of facial products and this is the only one that has made a visible improvement. It has evened out my overall complexion and my face looks brighter and more youthful. I will definitely be continuing with this product.No More Redness/Flaking Skin5Jtracy from undisclosedI have suffered from redness and flaking skin for a minute and after using this serum for a month once daily, my skin hasn't shed once. 10/10. I use it in the mornings before I apply my Ultra Facial Cream and now I am looking at adding the rest of their serum line to my regimen.Great!5Lily_369 from WAreally works. my skin looks smother and brighter, and pores around nose smaller. I see fewer break out around periods.It is a good product.3bob45 from undisclosedIt is a good product.wish more useful.Hope can we use more better product.Great serum5Dina Marie from TexasI love this serum. I used retinols previously & was trying to find an alternative with pregnancy. I have less breakouts, oil production and my pores are smaller.Oil control5Divadebz526 from Atlanta,GAThis also was for oily skin. Seems to be working wellI recommend this product that worked for me5jmjones10 from Dallas, TXI needed something for my forehead that is always oily. Even though this product seems oily itself, I apply it at night & in the morning, it seems to have helped. I like it, because I only use 1 drop on my forehead at a time. It goes a long way, so it should last a long time. Glad I found this product.Amazing for redness and minimizing pores5Sahrish from Brooklyn, NYThis serum from Kiehls was so fun to try. I was having a lot of breakouts and my skin was really dull and red from all of the inflamed pimples. I am pregnant so I have been dealing with a lot of hormonal acne. This made my skin look brighter for two days. I use it every morning and have noticed that my pores have shrunk and the redness from my pimples has decreased. This is also great if you have oily skin and need to get rid of the extra oils.