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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: $108.00

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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

Powerful-Strength Vitamin C Serum is rated 4.5 out of 5 by 798.
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
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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
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