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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: $68.00

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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 826.
Rated 5 out of 5 by from great features It's really a great deal that buy one get one free. And I use it daliy, and keep a few to use in the future.
Date published: 2020-05-24
Rated 5 out of 5 by from Visible difference right away Ive been using a free sample for about a week now. Since the very first night there was a visible difference in my dark/tired under eyes! After just one week my face looks a lot brighter as a whole because of it! I don’t even feel the need to wear as much concealer, such a nice feeling! I will be purchasing and I highly recommend.
Date published: 2020-05-22
Rated 5 out of 5 by from Instant results! I'm 30 years old, I don't have fine lines or wrinkles yet, but I purchased this product to help refine my pores and rejuvenate my skin. I apply it only in the morning (I use the Midnight Recovery Oil at night and don't want to pack my skin with layers of products) and have used it for only a week, and I've already noticed a HUGE difference! The product is doing exactly what I hoped for. My pores are more refined, and my skin looks so much healthier and youthful! My skin doesn't look dull anymore, but looks refreshed everytime I look in the mirror. I LOVE this product and will continue to use it in my daily routine!
Date published: 2020-05-19
Rated 5 out of 5 by from Love love love it! I absolutely love this product! 100% worth the investment. My skin feels and looks amazing. I’ve been using it for one month and I’m sure I can see a slight reduction in how visible the lines are between my eyebrows. I will continue to use this forever more
Date published: 2020-05-19
Rated 5 out of 5 by from Shine bright like a diamond feels! My mom is 53 but she can pass as a 25 year old lady! I got so jealous I had to ask what was she doing to maintain her beautiful face! She recommended this product to me, and boy, does it make wonders! It made my face glow and healthy looking! The serum is lightweight and easy to apply on. I thought the texture is oily, but it isn’t! This vitamin c product is worth it even if it almost costs a bill!
Date published: 2020-05-15
Rated 5 out of 5 by from It really works I tried this product first as a free sample & felt it had improved the area where I was using it between my eyebrows. I am 40 & have a deep furrow there. I bought a bottle & have used it for a few weeks now & I don’t think my skin has looked so good since my early 30’s. My skin not only looks better it feels lovely & smooth too.
Date published: 2020-05-07
Rated 5 out of 5 by from Visible results I gave it 5 weeks to test and review this product. My early fine lines visibly reduced, skin feels smoother and brighter. However, I had a difficult start with this product as it clogged my pores at the beginning and I broke out (unusual for my dry skin). I had to up my cleansing routine and since then it was all good. Also, as some of other reviewers mentioned, my hands started smelling like a fake tan, so I always wash my hands very well with soap after using the product. Overall a great and effective product, but some adjustments were needed from my side for it to work.
Date published: 2020-05-06
Rated 5 out of 5 by from Results in less than a week! Started using this serum and saw an improvement in the texture and tone of my skin in as little as 3 days! My skin was so much brighter, red spots and hyperpigmentation had started to look faded and my mom even commented that my skin was looking glowy...this serum is so bomb so far
Date published: 2020-05-04
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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

When do I use this?

Should this be used before or after a retinoid peptide serum?
Asked by: Kaytee
Hi there, thanks for your inquiry! We apologize but we can only speak on behalf of Kiehl's products. The way you would incorporate the Powerful-Strength Vitamin C Serum into your regimen would be: Cleanser, toner, Powerful-Strength Vitamin C Serum, Moisturizer, Eye Cream. Sunscreen. We hope this helps!
Answered by: KiehlsCCC
Date published: 2020-05-19

Is it safe to use on oily/acne prone skin? The texture seemed to be too rich and my worry is it might cause breakouts

Asked by: Ana001
Hi Ana! Thank you for reaching out about Powerful-Strength Vitamin C Serum. This product is Dermatologist-tested for safety and can be used on all skin types. We hope you can give this a try!
Answered by: KiehlsCCC
Date published: 2020-04-08

vitamin C serum

Should I store the vitamin C serum in the refrigerator after opening?
Asked by: ElaPela
Hi there! We recommend that our products be stored in a cool dry place. If you have any other questions about proper storage, feel free to give us a call!
Answered by: KiehlsCCC
Date published: 2020-04-01

Firm eyelids

I've started putting a little bit on my eyelids thinking this may help them firm up. Now I see we shouldn't put the serum near our eyes.. Please advise.
Asked by: Suzi2828
Hi there! Thank you for your interest in our Powerful-Strength Vitamin C Serum. Avoid the eye area because this product is not tested around the eye area. We hope you found this information helpful!
Answered by: KiehlsCCC
Date published: 2020-03-30
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