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Powerful-Strength Vitamin C Serum

A potent Vitamin C serum formulated with 12.5% Vitamin C and Hyaluronic Acid.

Powerful-Strength Vitamin C Serum

A potent Vitamin C serum formulated with 12.5% Vitamin C and Hyaluronic Acid.

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Total: $22.00

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Product details

Boost radiance, visibly firm skin and diminish the appearance of fine lines, wrinkles and pores with our customer-favorite Vitamin C serum. Formulated with 10.5% L-Ascorbic Acid and 2% Ascorbyl Glucoside plus Hyaluronic Acid, this patented, water-free concentrate helps improve skin’s appearance for radiant, younger-looking skin.

  • Helps visibly reduce lines and wrinkles while helping firm skin over time
  • Smoothes skin’s texture and helps visibly minimize the appearance of pores
  • Antioxidant Vitamin C penetrates skin’s deeper surface layers and remains effective in skin for up to 6 days
  • Provides visible results in just 2 weeks
  • Dermatologist-tested for safety
  • For all skin types, including sensitive skin
Key Ingredients
Vitamin C

Pure Vitamin C

L-Ascorbic Acid, also known as Pure Vitamin C, is a highly efficacious antioxidant known for its ability to improve the appearance of aging skin. In addition to antioxidant protection, Pure Vitamin C is known to help boost radiance, improve texture and visibly reduce the appearance of lines, wrinkles and other signs of aging.

Vitamin C

Vitamin Cg

Vitamin Cg, or Ascorbyl Glucoside, is a Vitamin C derivative that activates once absorbed into the upper layers of the skin’s surface. With antioxidant benefits, this form of Vitamin C is frequently used in anti-wrinkle skincare products to help reduce facial lines over time.

Fragmented Hyaluronic Acid

Fragmented Hyaluronic Acid

Hyaluronic Acid acts like a sponge to draw moisture into skin’s surface layers and then expands as it absorbs. Within our formulas, Hyaluronic Acid is known to help smooth and plump skin.

See Full List
Print

Boost radiance, visibly firm skin and diminish the appearance of fine lines, wrinkles and pores with our customer-favorite Vitamin C serum. Formulated with 10.5% L-Ascorbic Acid and 2% Ascorbyl Glucoside plus Hyaluronic Acid, this patented, water-free concentrate helps improve skin’s appearance for radiant, younger-looking skin.

  • Helps visibly reduce lines and wrinkles while helping firm skin over time
  • Smoothes skin’s texture and helps visibly minimize the appearance of pores
  • Antioxidant Vitamin C penetrates skin’s deeper surface layers and remains effective in skin for up to 6 days
  • Provides visible results in just 2 weeks
  • Dermatologist-tested for safety
  • For all skin types, including sensitive skin
Print
Vitamin C

Pure Vitamin C

L-Ascorbic Acid, also known as Pure Vitamin C, is a highly efficacious antioxidant known for its ability to improve the appearance of aging skin. In addition to antioxidant protection, Pure Vitamin C is known to help boost radiance, improve texture and visibly reduce the appearance of lines, wrinkles and other signs of aging.

Vitamin C

Vitamin Cg

Vitamin Cg, or Ascorbyl Glucoside, is a Vitamin C derivative that activates once absorbed into the upper layers of the skin’s surface. With antioxidant benefits, this form of Vitamin C is frequently used in anti-wrinkle skincare products to help reduce facial lines over time.

Fragmented Hyaluronic Acid

Fragmented Hyaluronic Acid

Hyaluronic Acid acts like a sponge to draw moisture into skin’s surface layers and then expands as it absorbs. Within our formulas, Hyaluronic Acid is known to help smooth and plump skin.

See Full List

what it is

A Vitamin C serum that boosts radiance, helps firm skin and visibly diminishes fine lines, wrinkles and pores for smoother-looking skin. Formulated with 10.5% L-Ascorbic Acid and 2% Ascorbyl Glucoside plus Hyaluronic Acid, this patented, water-free concentrate is a Kiehl’s customer favorite.

what it’s good for

  • Helps visibly reduce lines and wrinkles while helping firm skin over time
  • Smoothes skin’s texture and helps visibly minimize the appearance of pores
  • Antioxidant Vitamin C penetrates skin’s deeper surface layers and remains effective in skin for up to 6 days
  • Provides visible results in just 2 weeks
  • Dermatologist-tested for safety

key ingredients

Key Ingredients

Pure Vitamin C

L-Ascorbic Acid, also known as Pure Vitamin C, is a highly efficacious antioxidant known for its ability to improve the appearance of skin aging. In addition to antioxidant protection, Pure Vitamin C is known to help boost radiance, improve texture and visibly reduce the appearance of lines, wrinkles and other signs of aging.

Vitamin Cg

Vitamin Cg, or Ascorbyl Glucoside, is a Vitamin C derivative that activates once absorbed into the upper layers of the skin’s surface. With antioxidant benefits, this form of Vitamin C is frequently used in anti-wrinkle skincare products to help reduce facial lines over time.

Fragmented Hyaluronic Acid

This fast-absorbing form of Hyaluronic Acid is known for its ability to hold up to 1,000 times its weight in water. Acting like a sponge, it draws moisture into skin’s surface layers and expands as it absorbs. Hyaluronic Acid is known to help smooth and plump fine lines and is commonly used in skincare products intended to visibly reduce facial lines and refine texture.

SEE FULL INGREDIENT LIST

how to apply

  • Cleanse skin thoroughly prior to application
  • Apply Vitamin C serum over entire face, avoiding the eye area
  • As it blends into skin, you may experience a feeling of warmth as the formula activates
  • Apply morning and night, after cleansing and toning and before your moisturizer
  • Avoid the eye area; in case of contact with eyes, rinse them immediately
  • Discover our other anti-aging formulas like our anti-aging face cream and nighttime facial oil

did you know?

Kiehl’s became pioneers in Vitamin C skincare when we first stabilized Vitamin C in our efficacious, water-free concentrate. Our patented Vitamin C serum is highly stable ensuring that our formula is concentrated with an efficacious amount of Vitamin C while still being suitable for sensitive skin. Within our formula, our Vitamin C penetrates skin’s deeper surface layers—up to 10 layers deep!

results

After

After

Before

Before

IMMEDIATELY: Visibly Improved Skin Texture and Boosted Radiance

IN 2 WEEKS: Reduced Lines and Wrinkles

IN 4 WEEKS: Visibly Reduced Deep-Set Wrinkles

Results from an 8-week clinical study. Photos not retouched. Individual results may vary.

Immediate Week 2 Week 4 Week 8
Radiance checked checked checked checked
Decreased Facial Lines checked checked checked checked
Skin Texture checked checked checked checked
Decreased Deep-Set Wrinkles checked checked
Decreased Lip Lines checked checked
Improved Firmness checked
Visibly Reduced Pores checked
The Truth About Vitamin C Skin Care

LEARN THE TRUTH ABOUT THE BENEFITS OF VITAMIN C FOR SKIN

learn more

Frequently Asked Questions

What makes Kiehl’s Powerful-Strength Line-Reducing Concentrate unique?

Our formula is clinically demonstrated to help reduce the appearance of lines and deep-set wrinkles, while boosting radiance and helping even skin texture over time. Formulated with antioxidant Pure Vitamin C, which is a powerful skincare ingredient that begins working immediately, our Vitamin C serum is potent, yet gentle enough for sensitive skin and formulated to enhance the efficacy of Vitamin C benefits with continued use. Our formula is specially designed to stabilize Vitamin C. It’s true, Pure Vitamin C can degrade when exposed to water, but our water-free formula helps to keep the high concentrations of Pure Vitamin C stable and effective.

What are the benefits of Vitamin C?

From boosting radiance to helping diminish the signs of aging to antioxidant protection, Vitamin C is a highly efficacious skincare ingredient with a wide range of benefits. It’s a popular ingredient with proven results and lots of science and research to back up its benefits for your skin. One of the best ways to incorporate this tried-and-true ingredient is in a Vitamin C serum, like our Powerful-Strength Vitamin C Serum. These concentrated complexion boosters provide a targeted treatment to help your skin look brighter, smoother, and healthier.

What are the different forms of Vitamin C within Powerful-Strength Line-Reducing Concentrate?

There are actually several different forms of Vitamin C that are used in skincare formulas. Vitamin Cg, or Ascorbyl Glucoside, is a potent derivative of Vitamin C that provides antioxidant protection and helps to minimize the visible signs of aging. Our Vitamin C serum is formulated with 2% Vitamin Cg to help enhance the efficacy of Vitamin C benefits over time. While they have overlapping benefits, Pure Vitamin C (L-Ascorbic Acid) is absorbed into skin and starts working immediately upon contact while Vitamin Cg (Ascorbyl Glucoside) activates once absorbed into the upper layers of skin to boost Vitamin C activity over time. Kiehl’s Vitamin C serums and formulas effectively incorporate a form of topical Vitamin C that is carefully selected to maximize its targeted efficacy.

Should you pair Powerful-Strength Line-Reducing Concentrate with SPF?

We always recommend using SPF protection to help keep skin protected from UVA/UVB rays and pollution, which can cause the first signs of aging. The antioxidant benefits of Vitamin C can complement the protective effects of SPF. In fact, it is beneficial to apply Vitamin C before you head outdoors. Topical Vitamin C has been demonstrated to decrease generation of UVA-induced free radicals and can bolster skin’s antioxidant defenses with Vitamin E regeneration.

What age is a Vitamin C serum recommended for?

Our Vitamin C formula is designed for all ages and helps to visibly treat fine lines and wrinkles, uneven skin texture and the appearance of pores. Vitamin C levels deplete in skin over time, so using skincare products with Vitamin C is important as you grow older. However, our formula is still effective to use before you start to see fine lines and wrinkles. Our Vitamin C serum helps boost radiance and provide antioxidant protection to help defend skin from early signs of aging.

Is a Vitamin C serum recommended for sensitive and acne-prone skin?

Our vitamin C serums are carefully formulated and tested to be gentle enough for sensitive skin. Kiehl’s Powerful-Strength Line-Reducing Concentrate is formulated with Fragmented Hyaluronic Acid to help reduce the appearance of deep wrinkles and even skin texture for all skin types, including sensitive skin. When first starting with a Vitamin C serum, we recommend using once a day and building gradually to twice daily usage. If you have specific concerns, however, consult your dermatologist before incorporating new skincare products into your routine.

Does Powerful-Strength Line-Reducing Concentrate help with hyperpigmentation?

While this potent form of Vitamin C penetrates the skin’s surface layers to help visibly even skin tone and enhance clarity, we recommend our Clearly Corrective Dark Spot Solution for a targeted approach to treating hyperpigmentation and dark spots.

How do you apply your Vitamin C serum?

After you cleanse and tone your skin, apply 1-2 pumps of our Vitamin C serum. Smooth it on morning and night before your moisturizer to help lock in the skin benefits of your Vitamin C serum. While Vitamin C help defends skin during the day, it is also an effective ingredient to use in your nighttime skincare routine. For best results, use your Vitamin C serum twice a day, morning and night.

How often should you apply a Vitamin C serum?

As with products formulated with active ingredients, when first beginning to use a Vitamin C serum, start with a once-daily application, and gradually build to twice a day. With regular recommended usage in the morning and at night, our 50ml formula should last approximately 1 month. Always consult with your dermatologist when incorporating new skincare products into your routine.

Where do you store your Vitamin C serum?

Because L-Ascorbic Acid serums can degrade in heat and humidity, putting yours in the medicine cabinet could cause it to lose its effectiveness. While many L-Ascorbic Acid serums come in dark-colored or amber bottles that can help protect the formula from light, you should still be sure to keep your products away from direct sunlight.

Is it safe to use this product during pregnancy and breastfeeding?

While every ingredient we use in our products is evaluated for safety, we do not specifically test our products on women who are pregnant or nursing. Kiehl’s ensures there is substantial information supporting the safety of our products when used as directed by consumers. However, as there could be certain ingredients that physicians may not recommend for use during pregnancy and nursing, we always recommend that you discuss this with your physician and follow their advice.

Powerful-Strength Vitamin C Serum is rated 4.5 out of 5 by 825.
Rated 5 out of 5 by from Love this product My daughter bought this as a Christmas gift and I think it is one of my favourite products. Feels fantastic and really improves my skins look
Date published: 2020-04-21
Rated 1 out of 5 by from Got an allergic reaction from it and scars I bought it a couple of months ago and my skin started to break out like crazy. I contacted Kiehls and was told that my feedback was very important and nothing further. After all those months I still have red akne scars as a result of using this cream. I have a dry skin with a need of hydration and I almost never have akne. Also akne I got were very different from the usual one: big, dark red and very itchy.... My theory is that it is probably not s9o good for a young skin but at the same time it worked well for my mother. The problem is that a consultant in Kiehls RECOMMENDED this product for my type of skin...
Date published: 2020-04-20
Rated 5 out of 5 by from Love this love this product so much ! Finally I find something that actually works !!! My skin is brighter and my spot has definitely reduced ....Kiehl’ love you so much
Date published: 2020-04-19
Rated 3 out of 5 by from Strange smell and no noticeable improvement I bought several products over twelve months ago with a view to using them in a complimentary way. I had great hopes for improvements to my skin - mainly larger pores around my chin and general ageing - but there is no discernible change. This product is not even pleasant to use. It smells very 'irony' ie like drying blood, if that makes sense. The only reason for persevering was that I hoped it would work some sort of miracle!
Date published: 2020-04-18
Rated 1 out of 5 by from Bad Batch? I have been using the Powerful-Strength Line-Reducing Concentrate for a few years and usually love the product. Bought a new bottle at the end of February and the serum has already oxidized with only a quarter of the bottle being used and kept away from direct sun and heat in my bedroom. This is the first time the product will not absorb into my skin and pills with layering moisturizers no matter what cleanser, toner or scrub combination I use. Highly disappointed and hoping this is a one off bad batch/bottle.
Date published: 2020-04-12
Rated 2 out of 5 by from Penetrated my wallet not my skin This was very topical in the sense that I didn’t find that it soaked into the layers of my skin whatsoever. It was very mask like and so that’s the way I chose to apply it at night as a sleeping mask. In the morning, my skin was left uneven, patchy and a tad dry. I think this is because of the (lack of) stability of vitamin C in general and not necessarily the formulation. Overall I didn’t find the product to brighten my skin and I won’t repurchase or recommend.
Date published: 2020-04-11
Rated 5 out of 5 by from Great futures I bought second time and I really love this serum! My skin is soft, brighter and looks like wrinkles gone! That’s amazing! Love this product!
Date published: 2020-04-10
Rated 1 out of 5 by from Not good I was looking forward to using this product but it stings my face every time I put it on.
Date published: 2020-03-31
Rated 4 out of 5 by from Amazing one of my favorite vitamin C serum. non comedon and not make my skin yellow)
Date published: 2020-03-27
Rated 5 out of 5 by from Absolutely amazing I rarely write reviews but I have never experienced such a difference with a beauty product. I didn't have too many skin issues to start with. I'd say my skin is "normal", although it can look dull and tired. I've also got some post pregnancy spots and uneven skintone. I've been using this for about two months and I'm thrilled with the results. My skin is even in tone, my pores are minimized, and I've got this incredible youthful glow!! I couldn't be happier! Highly recommend this product and I'm looking forward to using it for many years to come.
Date published: 2020-03-23
Rated 4 out of 5 by from Seems to work I replenished this after using a sample I felt was working for my deeper lines...it can sometimes feel greasy but if you get the amount right for your skin it’s smooth and works in nicely to your skin. Note: I decided to buy this because Kiehl’s kept pestering me to use my rewards points - which I know exist. But when I log in to my account I get a blank screen while looking for “my rewards”...and can not access this “expiring” coupon. Why?
Date published: 2020-03-16
Rated 5 out of 5 by from Love this one SO much I have normal skin without any particular problems. I just want something to keep my skin as nice as it is. This product did more then that. I saw visual improvement in my skin. My skin jot brighter and smoother. It felt weird the first time I applied it on the skin because it warms right away. You get used to it. One pump goes a long way. Would definitely recommend this.
Date published: 2020-03-15
Rated 5 out of 5 by from Amazing!! After using it for 12 days, yesterday, I received a comment from someone surprised by how good my skin looked! It's really amazing how effective it is. My question is: How long can it be used? After eight weeks of treatment, can you continue or is it advisable to rest for a while?
Date published: 2020-03-04
Rated 1 out of 5 by from Do not ware your money I have been using this serum day and night for over 2 months. Don’t see any difference in my skin . Shall I try longer ?
Date published: 2020-03-03
Rated 5 out of 5 by from Nice I really loved it,it avtivates on your skin,when you put it on you feel that your skin is getting a bite warm,so soft and gentle,smells like orange,absorbs quickly.
Date published: 2020-03-02
Rated 5 out of 5 by from Treat for the skin I am very pleased with this line reducing concentrate , after 10 days use my skin is softer.
Date published: 2020-03-01
Rated 3 out of 5 by from Formula changed I bought my first bottle a few months ago. LOVED it. Within a couple days my face looked better. Moisturized, better texture. THEN I bought a 2nd bottle. The color was different (white, 1st bottle yellow) and it smelled different and felt different on my skin. Returned to store for exchange. Same thing with a new bottle. Just ordered 3rd bottle direct from Kiehl's so will see how this is. Very expensive but was willing to use as I loved results. Not so much anymore.
Date published: 2020-02-29
Rated 5 out of 5 by from Feels incredible on your skin This serum feels so amazing on the skin, it is so smooth and leaves skin feeling extremely soft. I love vitamin C products. I am not sure if it is doing much for the fine lines on my forehead but I guess time will tell! I would like to know how long it will take for me to start seeing results?
Date published: 2020-02-17
Rated 3 out of 5 by from Old version was much better I used 2 large bottles of the original product which did not have hyaluronic acid. I loved it as it made my skin bright and decreased oil production. The new version unfortunately makes my skin oily..
Date published: 2020-02-15
Rated 5 out of 5 by from The number one thing I’ll never give up Y’ALL! I get compliments on my skin all the time and I tell everyone that this is the one product I can’t go without is this one. I’ve been using this one for about 5 years. One time I ran out and was lazy to get more and wow. My skin was noticeably dull. Need your skin to glow? This does it! I cleanse, tone and then apply this serum then moisturizer and sunscreen. It’s absolutely worth the price and the extra step in the morning. You won’t regret it!
Date published: 2020-02-08
Rated 3 out of 5 by from No Improvement in fine lines I have fine lines in forehead. I use this serum after toner every morning. It’s been an year and not a bit of improvement in the fine lines. I am very disappointed that it’s working for many people and not for me.
Date published: 2020-02-07
Rated 2 out of 5 by from no visible effects I purchased this at the recommendation of a Kiehls employee who said I should consider it for help managing fine lines and large pores. I've used it with the other Kiehl's products in my normal regimen (ultra facial cleanser and ultra facial moisturizer for oily skin) for the last six weeks and have not seen any impact of using this product.
Date published: 2020-02-06
Rated 1 out of 5 by from Weird!!! I have to join the slew of bad reviews of this product. I bought this serum after receiving a sample. It seemed good but then I noticed my hands smelling really bad. It wouldn't wash off and it lasted for days. The smell was of metal. I went to the doctor. They ran tests and said it has to be something topical. I never in a million years thought it would be this serum. Once I discontinued the use my hands stopped smelling. I started again two weeks later and the smell returned. I know it sounds funny but as I was sitting in my office I could smell my hands and it was driving me nuts!
Date published: 2020-01-28
Rated 1 out of 5 by from Effective but ruined all of my clothes It is an effective serum and I would like to use this on my neck and during nighttime but I can't because it stained all of my clothes (esp shirts with collars) and my pillow cases. Most of the dry cleaners, except for one, were unable to get rid of the orange stain.
Date published: 2020-01-23
Rated 4 out of 5 by from Incredible results, but... I have been using this product for about a month, and have been really impressed with the results. My skin feels so soft, and has looked the brightest and clearest it has been it a long time. The serum is light and quickly absorbed, and feels great on the skin, plus it is very mattifying so doesn't leave my skin looking greasy. The only issue I have with this is that after a few weeks using it, I have noticed my face/hands smells like I have used fake tan. I expect this is a result of the ascorbic acid oxidising into to erythrulose. It is a little off putting, but it is the only bad thing I have to say about it.
Date published: 2020-01-21
Rated 5 out of 5 by from Amazing!!! I have only been using this for a few days and already my skin texture is so smooth!!! I mainly bought for fine line reduction I’m sure that will take some time. If you’re thinking of buying just do it, your skin will thank you. I will be a forever user!
Date published: 2020-01-20
Rated 2 out of 5 by from Confused?!? I received this product as a sample and was in love so I decided to make purchase. This product does not seem the same. It continues to leave my hands stained and my hands and face in the morning smell like I have used a gradual tanner. Wish it was performing like it had when I sampled.
Date published: 2020-01-16
Rated 5 out of 5 by from Love this So far I love this product using it regularly I do see wrinkle line reducing slowly happening. Keep away from eyes.
Date published: 2020-01-11
Rated 3 out of 5 by from Made my skin orange I do not know if I was being paranoid, I looked a bit orange tanned after 1-2 weeks and it turned back to my normal skin tone after stopped using it for around 2 weeks. Even my friend could see the difference. So I looked it up, it said some Vitamin C preparations discolour when they are oxidized and may emerge on the skin. I do not know if this is the reason my skin turned orange. I guess it is just not something for me. I think the packaging should be improved anyway, since it contains high concentration of Vitamin C, there should be a lid to keep it from oxidation. I am a bit disappointed since it is quite pricey.
Date published: 2020-01-03
Rated 1 out of 5 by from A dirty bottle with no manufacturer seal I purchase this online and when I received it, there is no manufacturer seal. The bottle is very dirty and it doesn't even seem to be a full bottle. I'm not trusting it. I can't exchange it in store and I need to pay the return shipping fee to return it even if it is not my fault. Worst shopping experience ever. Will never buy anything from Kiehls.com.
Date published: 2019-12-27
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Does this serum clog pores?

Asked by: lilymay
Hello there! Thank you for your interest in Powerful-Strength Vitamin C Serum. This product smoothes skin’s texture and helps visibly minimize the appearance of pores. We are pleased to inform you that this product has Dermatologist-tested for safety. We hope this information is helpful and we wish you great success with our products!
Answered by: KiehlsCCC
Date published: 2020-03-16

Can this be used with Tretinoin?

Can this be used with Tretinoin? If so before or after Tretinoin application?
Asked by: JanaK
Hi there! For anyone with sensitive skin or using multiple products, we recommend you reach out to your dermatologist to decide what products will be best suited for your skin. If you have any other questions, feel free to reach back out!
Answered by: KiehlsCCC
Date published: 2020-03-10

What is the shelf life of this if unopened? I bought two and now I'm worried.

Asked by: Pattycakes
Our products have been tested to have at least a 3-year shelf life if unopened and stored at normal room temperature, during which they will retain their integrity and perform as expected. After product has been opened, discard after 6 months.
Answered by: KiehlsCCC
Date published: 2020-03-02

Can I use this with the hydro-plumping retexturing serum? If yes, what order? If no, can I use one at night and one in the day?

Asked by: Tab1114
Hi there! Thank you for your interest in our Powerful-Strength Vitamin C Serum. Both these products morning and night. They are both serums so they can be used in any order. We hope you found this information helpful!
Answered by: KiehlsCCC
Date published: 2020-02-24

Is there a benefit to using this over Men’s Age Defender Power Serum?

Should this be used instead of or in combination with Age Defender Power Serum?
Asked by: OriginalOG
Hi there! The Powerful-Strength Vitamin C Serum is a Vitamin C serum that boosts radiance, helps firm skin and visibly diminishes fine lines, wrinkles and pores for smoother-looking skin. If these are concerns you are looking to correct, we suggest using the product before the Men’s Age Defender Power Serum. We hope this helps and that you can use our products with great satisfaction!
Answered by: KiehlsCCC
Date published: 2020-02-10

Can I use this just at night?

Can I use this just at night and another concentrate in the morning or should I pair the 2 in the morning and do it alone at night?
Asked by: Kaymac
Hello! Thank you for inquiring about Powerful-Strength Vitamin C Serum! Best way to use is to apply morning and night, after cleansing and toning and before your moisturizer. If you want to only use it at night that it fine. You just want to ensure that you never use a vitamin C and a retinol together. We hope you try it out soon!
Answered by: KiehlsCCC
Date published: 2020-01-31

storage

how do i store this product? is it better to store it in the fridge like any other vitamin c products?
Asked by: drafwan
Hi there, thanks for your inquiry! We do not suggest storing the Powerful-Strength Vitamin C Serum in the refrigerator as it has been tested to be stored at a normal room temperature. We hope this helps and that you can continue to use our products with great satisfaction!
Answered by: KiehlsCCC
Date published: 2020-01-16

Can this be used alongside the Nightly Refining Micro Peel Concentrate? If yes, in what order?

Asked by: Superbokkie
Hello! We do not suggest applying both Powerful-Strength Vitamin C Serum and Nightly Refining Micro-Peel Concentrate together. It can be too much for the skin, as our Nightly Refining Micro-Peel Concentrate does exfoliate and promote cell turnover. We hope you find this information to be helpful!
Answered by: KiehlsCCC
Date published: 2020-01-15

Is this product safe for use during pregnancy?

Asked by: SRYCG
Hi there! While every ingredient we use in our products is evaluated for safety, we do not specifically test our products on women who are pregnant or nursing. Kiehl's ensures there is a substantial information supporting the safety of our products when used as directed by consumers. However, as there could be certain ingredients that physicians may not recommend for use during pregnancy and nursing, we always recommend that you discuss this with your physician and follow their advice.
Answered by: KiehlsCCC
Date published: 2019-11-21

Can this be used with the midnight recovery oil? If so in what order?

Asked by: Amers
Hi there! Our Powerful-Strength Line-Reducing Concentrate can absolutely be used with our Midnight Recovery Concentrate! Please make sure to apply the Powerful-Strength Line-Reducing Concentrate first before applying the oil. You will love the results!
Answered by: KiehlsCCC
Date published: 2019-11-21

Can this be used with Clearly Corrective Brightening & Smoothing Moisture Treatment

Can I use this with the Clearly Corrective Brightening & Smoothing Moisture Treatment?
Asked by: Titan
Hi there! Yes, this can be used along with the Clearly Corrective Brightening & Smoothing Moisture Treatment. We hope you can give it a try!
Answered by: KiehlsCCC
Date published: 2019-11-12

Is this product suitable for man use also? ( was recomndad ro me in London Kielhs store)

Asked by: Ggg123
Yes, this product is suitable for use on men and women. This product helps visibly reduce lines and wrinkles while helping firm skin over time. It also smoothes skin’s texture and helps visibly minimize the appearance of pores. We hope you can give it a try!
Answered by: KiehlsCCC
Date published: 2019-11-07

How to use this product?

I have seen someone already asked this question but it has not bee answered properly. On you website there is an information about product itself but not about application. Should it be used on the top of the cream or how? Thanks
Asked by: Katarina35
You can put it on before your moisturizer. And if you use an oil as well put this on first , then the oil, then the moisturizer. I’d give it a minute to dry before applying the moisturizer.
Answered by: Michaeljarthur26
Date published: 2020-01-31

I am at the age of thirty and has pigmentation and non-fresh skin Is this a useful product for my condition

I use a moisturizer and a serum from Kiehl's
Asked by: Siryas
Hi there Siryas, thanks for reaching out to us. Our Powerful-Strength Line-Reducing Concentrate is for all skin types, including sensitive skin. We hope this information was helpful and that you continue using Kiehl's products with great satisfaction!
Answered by: KiehlsCCC
Date published: 2019-11-01

What is the percentage of hyaluronic acid in this product?

Asked by: PJS1
Hi there, thanks for reaching out to us. We appreciate your interest in our products. Kiehl's considers formulas for our products proprietary.Since ingredients may have different functions in products depending upon their combination with other ingredients, the percentage of specific ingredients in any given product is not a measure of the ingredient's efficacy. It is the unique formula and technology that provides the desired result.As a company committed to the highest quality products, we take special care to ensure that all ingredients we use are safe and continually evaluate the most current information about our ingredients.We hope this information was helpful!
Answered by: KiehlsCCC
Date published: 2019-10-22

Explain the application process for the powerful strength line reducing concentrate and can it be used daily?

Asked by: Hattie
Hi there Hattie, thanks for reaching out to us. Our Powerful-Strength Line-Reducing Concentrate visibly reduces the appearance of fine lines and wrinkles, boosts skin radiance and improves texture. It also helps visibly minimize pores over time for smoother skin. It can be used twice a day, morning and night. To see details and how to apply this product, click here: http://tinyurl.com/y2ywc4lt. We hope this information was helpful!
Answered by: KiehlsCCC
Date published: 2019-10-10

I am acne prone does this product contain vitamin e which could cause me to break out?

Asked by: KitKat
Hi there! This product does not have Vitamin E. For your convenience an ingredient list is listed on the product page and on the packaging itself. We hope you can give it a try!
Answered by: KiehlsCCC
Date published: 2019-09-25

Is it safe for a teen to use?

Asked by: Yanny
Hi there! Thank you for your interest in our Powerful-Strength Line-Reducing Concentrate. Vitamin C levels deplete in skin over time, so using skincare products with Vitamin C is important as you grow older. However, these formulas are still effective to use before you start to see fine lines and wrinkles. These formulas help boost radiance and provide antioxidant protection to help defend skin from early signs of aging. However, always consult with your dermatologist when incorporating new skincare products into your routine especially for someone with less mature skin.
Answered by: KiehlsCCC
Date published: 2019-09-12

What is sequence of product application. After cleanser and toner...where does vitamin C serum fit in?

Asked by: Sejt
Hey there! You would apply our Powerful-Strength Line-Reducing Concentrate after cleansing and toning. This product can be used twice a day, morning and night. Our new and improved formula helps reduce fine lines and wrinkles while improving skin’s texture and radiance. We hope you find this information to be helpful!
Answered by: KiehlsCCC
Date published: 2019-08-30

Serum or this first?

I use a serum should I use that first or this??
Asked by: JasonDE
Hi Jason! We are happy that you reached out to us. We suggest applying the serum first. We hope you can continue to use our products with great results!
Answered by: KiehlsCCC
Date published: 2019-08-23

Before applying powerful could I apply tonic+facial cleanser and lotion?

I’d like to know if before applying powerful .... I should apply ford of all.. 1. Tonic 2. Centella sensitive fácil cleanser 3. Lotion And after applying powerful... could I apply... 4. Sun protection?
Asked by: Shirdt
Hi there! Thank you for inquiring about when to incorporate the Powerful-Strength Line-Reducing Concentrate into your skincare regimen. It is a Vitamin C serum that boosts radiance, helps firm skin and visibly diminishes fine lines, wrinkles and pores for smoother-looking skin. We recommend cleansing and toning first, following up with the Powerful-Strength Line-Reducing Concentrate. Afterwards, you can apply your moisturizer, and finish your routine with a sunscreen! We recommend our Super Fluid Daily UV Defense SPF 50+ with advanced UVA/UVB technology and pollution protection. Our daily, non-comedogenic sunscreen absorbs quickly and leaves a matte finish.You can find this product here: http://tinyurl.com/ycq4l7lx We hope this information is helpful to you!
Answered by: KiehlsCCC
Date published: 2019-12-13

Can we u it in any time of the day

Asked by: Nadz
Hi there! This product can be used morning and night, based on personal preference!
Answered by: KiehlsCCC
Date published: 2019-06-25

Not for the eye area?

Can I use this for eye area as well?
Asked by: Bostonmom
Hi there! We do not suggest using using products not intended for the eye in that area as the eye contour is the most sensitive area of skin on our body. For the eye area, we suggest you try our Powerful-Strength Line-Reducing Eye-Brightening Concentrate.Formulated with 10.5% L-Ascorbic Acid, or Pure Vitamin C, this efficacious eye treatment helps brighten and smooth for younger-looking eyes. We hope you can give this a try!
Answered by: KiehlsCCC
Date published: 2019-06-07

I am 29 years old, i don’t have any wrinkles but feel i my skin doesn’t have a glow. Wanted to know whether this product will help with that?

Asked by: Mehreen
Hi there! Thank you for your interest in our Powerful-Strength Line-Reducing Concentrate! This product helps reduce fine lines and wrinkles while improving skin’s texture and radiance. We suggest you try our Turmeric & Cranberry Seed Energizing Radiance Mask. Our exfoliating mask helps invigorate and brighten fatigued, dull skin. Formulated with Cranberry Seeds, this brightening mask leaves skin feeling soft and smooth. Here is a link with more information: http://tinyurl.com/y3976pda. We hope you can give this a try!
Answered by: KiehlsCCC
Date published: 2019-06-07

how long does the 50ml bottle last?

Asked by: Swatcat
Hi there! Thank you for your interest in our Powerful-Strength Line-Reducing Concentrate. With regular use in the morning and at night, the 50mL bottle should last between 1.5-2.5 months.
Answered by: KiehlsCCC
Date published: 2019-04-30

Toner first?

Do I have to use toner first before applying this vitamin c serum? Or should I apply it first thing after washing my face?
Asked by: clearskin
Hi there! Thank you for your inquiry regarding our Powerful-Strength Line-Reducing Concentrate. Following a proper skincare regimen, after cleansing your face you should use toner before applying a serum. A toner helps balance the skins pH, but it is a personal preference. We hope this was helpful!
Answered by: KiehlsCCC
Date published: 2019-03-21

Can this be used twice a day?

Hi! Can this be part of my morning and nighttime routine? Thanks!
Asked by: Cdenise
Hi there! Thank you for reaching out about Powerful-Strength Line-Reducing Concentrate. Our new and improved formula helps reduce fine lines and wrinkles while improving skin’s texture and radiance. Yes absolutely you can be used twice a day, morning and night. We hope you continue using Kiehl's with great satisfaction!
Answered by: KiehlsCCC
Date published: 2019-03-14

When do I apply?

I bought this and the midnight oil. For night time regimen-Do I apply the midnight oil, vitamin c and then my moisturizer? What about in the morning- would I apply vitamin c after cleansing and before moisturizer? Thank you
Asked by: Shirley
Hi there! Thank you for reaching out about our Midnight Recovery Concentrate and Powerful-Strength Line-Reducing Concentrate. Since the Powerful-Strength Line-Reducing Concentrate does contain Vitamin C, we do always suggest to apply that first after cleansing and wait for it to fully absorb. You can then follow it with your Midnight Recovery Concentrate and moisturizer. We hope this information was helpful and you continue to use our products with great satisfaction!
Answered by: KiehlsCCC
Date published: 2019-03-08

It okay to use it with Breakout Control Acne Treatment Facial Lotion?

I will be mainly using it to help me removing the dark spot and I'm currently using Breakout Control Acne Treatment Facial Lotion as a serum wondering if its going to conflict with Powerful-Strength Line-Reducing Concentrate, kindly advice.
Asked by: Alijuventus
Hi there! Our Breakout Control Acne Treatment Facial Lotion and Powerful-Strength Line-Reducing Concentrate are both targeted treatments and therefore are not recommended to be used together. We hope you can alternate these or choose one that is better suited for your needs!
Answered by: KiehlsCCC
Date published: 2019-12-13

Can you please advice me when you go back to original formula?

Your original was top notch. I would see almost immediate results,which was amazing. I do not know why companies always have to mess up a good thing. With the negative comments I have been reading & hearing lately, I will not be purchasing any time soon. You lost here a long time customer.
Asked by: imqt
Hi there, imqt thanks for sharing your feedback with us. We are sorry it seemed as if our Powerful-Strength Vitamin C Serum did not perform as expected. Your feedback is important to us and helps us improve our products. We will be passing your comments along to our team.
Answered by: KiehlsCCC
Date published: 2020-01-31
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