Kiehl’s Powerful-Strength Line-Reducing Concentrate Vitamin C Serum 100 ml / 3.4 fl oz
$101.25 reg $102.25
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Guests are saying
The Kiehl's Powerful Strength Vitamin C Serum is a highly regarded skincare product that many guests have found transformative for their skin. With a lightweight texture that absorbs quickly, it effectively brightens, smooths, and evens skin tone while minimizing fine lines. Guests appreciate its hydrating properties and the subtle citrus scent, making it a delightful addition to their daily routine. However, some have experienced irritation or changes in formulation, which may affect their experience.
Summary created by AI from text of reviews reflecting recent feedback provided across different star ratings (includes incentivized reviews)
4.5 out of 5 stars with 1961 reviews
5 out of 5 stars
17 May, 2026
originally posted on kiehls.com
Fine line SOS
Hydration is amazing and smooths out my wrinkles. 5 stars!
5 out of 5 stars
12 May, 2026
originally posted on kiehls.com
It’s working
I’ve been using this serum in conjunction with hyaluronic acid and retinol for the past six months. I can see a difference in my skin; specifically it looks brighter, plumper and less dry, and my age spots are slightly lighter. At age 70, it’s nice to be told my skin looks like a 50 year old’s. I can’t say it’s the vitamin c serum alone but certainly the combination of the three is a winner. Unlike other vitamin c creams on the market that are gritty, this one goes on super smoothly. I’ve ordered the larger size and plan to keep using it.
5 out of 5 stars
27 April, 2026
originally posted on kiehls.com
Loyal Customer!
I have used this product for over 10 years. I mix a few drops with Kiehls Ultra Facial Cream and use this combination twice a day.
5 out of 5 stars
24 April, 2026
originally posted on kiehls.com
Love it!
I have been using this product for years. Whenever I run out of the product my skin doesn’t look as refreshed.
5 out of 5 stars
22 April, 2026
originally posted on kiehls.com
great product, use every day
Vitamin C with the Ulitmate Moisture + SPF is the ticket
5 out of 5 stars
19 April, 2026
originally posted on kiehls.com
This product saved my skin from the winter heat.
This is a new product for me. With our exceptionally cold winter, I needed some extra help to deal with the dryness created by our over-worked heating system. After the first night, I could see an improvement. It is a miracle cream!
5 out of 5 stars
17 April, 2026
originally posted on kiehls.com
Great face serum
I have used this for years, and my dermatologist recommended it. I trust Kiehl's, and use this every day.
5 out of 5 stars
17 April, 2026
originally posted on kiehls.com
Amazing serum!
It is a great product! A little pricey, but worth it!
5 out of 5 stars
16 April, 2026
originally posted on kiehls.com
Vitamin C Serum
This is absolutely my favorite! You will feel the difference right away!
3 out of 5 stars
16 April, 2026
originally posted on kiehls.com
Not so sure
The product is nice, but my skin started breaking out which hasn't happened in ages. Also caused redness and irritation. Now I have a bottle of product that I cannot use.
1 reply from Consumer Care Center team - 1 month ago
Hi itsmeagain! We are sorry to hear about the experience you had with our Powerful-Strength Vitamin C Serum. We would like to speak with you directly about it. Please give us a call at 1-800-543-4572 Mon - Fri 10am-7pm EST for assistance and provide the case #46164356. Looking forward to speaking with you. It would be helpful if you could have the product available when you call.
5 out of 5 stars
15 April, 2026
originally posted on kiehls.com
High Quality Vitamin-C Serum
Wonderful product been using it for years and it absolutely makes a difference for skin health and appearance.
5 out of 5 stars
9 April, 2026
originally posted on kiehls.com
Great Product
This product has really even out my skin tone. Have been using it for a few years now.
3 out of 5 stars
6 April, 2026
originally posted on kiehls.com
Longtime repurchased but what changed?
Did the formula change? It used to be yellow instead of white and worked more immediately. I’m not noticing a difference the way I did in the last.
1 reply from Consumer Care Center team - 1 month ago
Hello Dvs214! We updated our Powerful-Strength Vitamin C Serum to a more potent 12.5% Vitamin C formula, now enriched with Hyaluronic Acid for deeper hydration. The change from yellow to white is a sign of improved stability! Pure Vitamin C is naturally white; a yellow tint can indicate oxidation, which reduces the product's strength. Our stabilized formula ensures you receive maximum potency in every application. While the immediate "feel" may differ from the original, we recommend continued use to see long-term results. If you're not completely satisfied, please reach out to our Customer Service team for assistance with a return or alternative!
5 out of 5 stars
5 April, 2026
originally posted on kiehls.com
Brightens my skin
This product makes my skin feel and look great. It appears to be brighter.
5 out of 5 stars
3 April, 2026
originally posted on influenster.com
Glowing secret
Literally my holy grail product! All you need for your morning skincare routine is just a sunscreen, a vitamin c, and a moisturizer (if your skin is too dry). your skin will glow!!
1 out of 5 stars
22 March, 2026
originally posted on kiehls.com
Not for me
The second time I used it. It immediately made my skin hot and irritated. The serum felt very gritty and dry. Soon after I had mini red bumps all over my face. I stopped using it.
1 reply from Consumer Care Center team - 2 months ago
Hi there! We are sorry to hear that you had this kind of reaction to our Powerful-Strength Vitamin C Serum. We would like to speak to you further about this, please call us toll-free at 1-800-543-4572 (available Mon - Sun 10am-7pm EST) provide case number 45812649.
5 out of 5 stars
16 March, 2026
originally posted on influenster.com
Starts working fast!
This serum changed the appearance of my skin within only the first 3 days of using it. I am glowing like never before!! It feels very luxurious upon application, the texture is silky and warming. It has already evened out my skin after such a short time of using it. My skin feels softer and healthier than it did before I used it. It is perfect for sensitive skin, it doesn’t break me out or feel irritating at all. Overall so happy I found this, it’s made a world’s difference already!
5 out of 5 stars
12 March, 2026
originally posted on kiehls.com
Best product for dry fabric skin
This product is awesome! I use it 2x daily. My skin is dewy all the time which is what I was looking for. I'm 72 & struggle with dry skin & this is my solution!
5 out of 5 stars
12 March, 2026
originally posted on influenster.com
Love love love
My favorite vitamin c serum. I have tried so many of these and nothing feels as nice on my skin as this. It is light weight, nice scent, and visibly adds brightness to my skin. Best one I’ve found on the market!
4 out of 5 stars
11 March, 2026
originally posted on kiehls.com
Noticeable results
When I use this continuously, my pores get smaller and my mature skin looks smoother. I took one star off bc it can be irritating for a sensitive skin gal like me, depending on the skin condition of the day. I use it in the morning, 3-4 times per week. It's not greasy and has a matte finish. It doesn't affect my makeup/sunscreen application.
1 reply from Consumer Care Center team - 2 months ago
We are sorry to hear about the experience you had with our Powerful-Strength Vitamin C Serum. We would like to speak with you directly about it. Please give us a call at 1-800-543-4572 Mon - Fri 10am-7pm EST for assistance and provide the case #45651852. Looking forward to speaking with you. It would be helpful if you could have the product available when you call.