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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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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 843.
Rated 5 out of 5 by from Amazing Been using since 12/2019, within weeks saw a difference. Just turned 34, experiencing fine lines and texture imperfections. This worked wonders. I know it's suggested NOT to apply near eyes, however my eye lid skin texture has enough, meaning fine lines that gave a "rough" appearance. However applying small amounts of this has fixed that issue.
Date published: 2020-07-09
Rated 4 out of 5 by from Delivers the Goods as Advertised Bought this during the BOGO special. I stored the 2nd bottle in the fridge. I do like this product. It goes on smoothly and is not greasy. I do see some improvement in my overall skin appearance. Without tether special, I would find this pricey. I will have to stock up during sales.
Date published: 2020-07-06
Rated 4 out of 5 by from Caution I like the facial effect of this serum, and a small amount goes a long way. I have very sensitive skin and found this to be too strong for use on my neck. I developed a burn-like rash after trying it on my neck. No problem using it on just my face.
Date published: 2020-07-02
Rated 3 out of 5 by from Not a miracle I purchased this product during a 40% off sale. I was so excited. The ratings and reviews had been glowing on this product. I received it on 05/15/20 and began to use it immediately. I've been using it every night since, for a little over 6 weeks now. I have not noticed a difference in my skin. There is a nice chart in the product description/results, and my skin has not experienced any of the results. I will continue to use it, but as of now I think it's just a bit of an overpriced moisturizer and not anything special.
Date published: 2020-07-01
Rated 5 out of 5 by from I've just purchased my second bottle! As a Man in my 40's I was looking to improve my skincare. I was sceptical at first as (being a typical Man) I didn't appreciate the importance of great skin care. ... But I bought this and I've not looked back since! The results are instant and impressive, my skin looks younger (truthfully) and I look visibly healthier. Any Men out there reading all the 'hype' for other brands in Men's Style magazines etc, don't waste your money, this is the product you need! .. Although I would also buy the Calendula Serum-Infused Water Cream to go with it, you can use the Cream as a post-shave and it compliments the Serum nicely! Ok Guys, its a bit expensive but honestly, it goes a long way and you won't be disappointed. I'm not endorsed/affiliated by Kiehl's to write this .. I've just wasted so much money on inferior products over the years, I want to do all you Guys a favour out there and say, 'stop looking' this is the product you need! There is no better serum for Men - and probably Women too ;-) - to look and feel great!
Date published: 2020-07-01
Rated 5 out of 5 by from My face looks smoother than ever I have struggled with acne and large pores for my whole life. I have never had smoother looking skin since using this product. I don’t know what kind of magic is in this bottle, but I am never going back. I still get occasional pimples, but my overall skin texture looks so much smoother, my pores look smaller, and my scarring has decreased a ton. I love the results.
Date published: 2020-07-01
Rated 5 out of 5 by from Fantastic Smell I’ve been buying this since I discovered Kiehl’s, use it every morning under my moisturiser. I love it, the smell is amazing, love that I’m giving myself a booster to vitamin C and help fight any ageing!
Date published: 2020-06-30
Rated 1 out of 5 by from High Hopes.. I bought this with high hopes after reading so many good reviews, unfortunately I am so disappointed. I do not have sensitive skin and nothing has ever affected me before, however after only 2 days using this product my under eyes became so itchy and uncomfortable. The skin is so dry, when I put any make up on top it creases badly and looks awful (never had any problems with this before). I decided to use it once a day and see if that made any difference but it has just given me more lines under my eyes, the skin is sore and my eyes look so puffy and tired. The product does not absorb well into skin either so I would not recommend this under make-up at all. I really wanted to like this product but after 3 weeks my eyes are worse than they were before, I had originally bought this for dark circles, however, now I have so many pronounced creases under my eyes that weren't there before!
Date published: 2020-06-29
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My serum turned pale yellow, does it still work?

Asked by: Chun

I'm using an anti-aging serum but not from your brand, should I use this first or my serum?

Asked by: Sansan91

I should this first and then put the midnight recovery?

Asked by: Nitin
Hi there! We suggest using the Powerful-Strength Vitamin C Serum in your morning regimen and the Midnight Recovery Concentrate in your night regimen. We hope this helps and that you can use our products with amazing results!
Answered by: KiehlsCCC
Date published: 2020-06-29

Animal testing -free?

Asked by: Clee068
Hi there! Kiehl's, a brand of L’Oreal, does not test any of its products or ingredients on animals and has been at the forefront of alternative methods for over 30 yrs. For more information, please visit L’Oreal's corporate site, to learn more on the alternative methods under the Inside Our Products section. We hope this helps!
Answered by: KiehlsCCC
Date published: 2020-06-26

I have just bought this Vit C serum and it has hyaluronic acid in it too. Do I need to apply it on damp face?

Asked by: Wingingit
Hi There, thank you for reaching out. We recommend to apply our Powerful-Strength Vitamin C Serum after cleansing your skin thoroughly. We hope this information helps!
Answered by: KiehlsCCC
Date published: 2020-05-20
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