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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 834.
Rated 1 out of 5 by from not recommended I have tried this several times, but it make my face feels like burnt and sting, it too sticky to absorbed by skin! I have connected the customer service by email, but nobody answer my email! Poor quality and service!
Date published: 2020-06-20
Rated 5 out of 5 by from Great Product! Reduces the magnitude and appearance of small superficial blemishes. Certainly it has yielded an improved appearance of my facial skin texture and also produces a brightening/healthy look. Very easy to apply, nonirritating, and does not impart a greasy feeling. This is an excellent product which I have used for years and it continues to offer pleasing/beneficial results.
Date published: 2020-06-08
Rated 5 out of 5 by from Thumps up! I bought this serum as a gift for my mum who is in her mid-50s and she loved it! She uses it in combination with Kiehl's Midnight Recovery and she has been really happy with the results. A few weeks after she started using both products, her skin glew and looked fresher. This serum is now one of her main skin care products.
Date published: 2020-06-06
Rated 1 out of 5 by from Worst thing I ever bought I bought this product 2-3 months ago and I was told it was amazing for your skin especially if you bought a few more products with it. However when I used it instead of reducing lines on my skin it made it much worse I definitely don’t recommend it to anyone! A TOTAL WASTE OF MONEY!!!
Date published: 2020-06-03
Rated 5 out of 5 by from WOW! I bought this about a month and a half ago and I swear after just one week my skin looked so much better. I’m 25 and my skin is sensitive and can get very dry so often looked blotchy and dry, and I always seemed to have the odd breakout. But since using this my skin looks like it’s glowing and has such a nice even tone now and my husband constantly comments on how nice it’s looking. The vitamin C seriously works wonders. This is the first time in my life that I’ve used a skin product and can confidently say okay this works! I just think it’s amazing and will definitely be buying again when my current bottle runs out.
Date published: 2020-05-31
Rated 5 out of 5 by from Smooth and luxurious I have failed to stick with a facial regimen before, finding other products a bit useless in terms of noticeable impact. But I have been using a combination of facial cleanse, toner, this concentrate and a moisturizer for about 3 months now and I’m seeing a really noticeable difference in my skin tone and the depth of the lines on my forehead. A small pea sized amount from the dispenser on each side of my face goes a long way. I’ve been using morning and night and the first bottle (50ml) is still going. A great product in combo with the calendula collection.
Date published: 2020-05-28
Rated 5 out of 5 by from Love this! Love this product! Feel like you can really feel it going to work instantly. Just purchased my second bottle and friends have commented on the improvement in my skin. I use combined with the Midnight Recovery Oil. My skin is normally super sensitive but these two seem to be the dream team for me. Highly recommend!
Date published: 2020-05-26
Rated 5 out of 5 by from My lines are definitely shallower I’m a 46 year old fella and last year decided to take the plunge with some skincare as I was looking a bit dull and worn. I admit that I thought of skincare as being too faffy and for those who wanted to look like celebrities. Anyhow I embarrassingly visited Kiehls to buy some products and I have eaten my words! I have been amazed with the results. I admit that a little vanity has crept in because I find myself looking at my skin in the mirror and I’m genuinely blown away. Woooohoooo! Here’s what I’ve used for the last 12 months: - Gentle Hair and Body Wash for Babies - my eczema hasn’t flared up once in all that time. - Iris Extract Activating Essence Treatment - this is like a drink for my skin, you can feel it being slurped up. - Powerful Strength Line Reducing Concentrate - I can honestly say that my skin looks healthy and my lines are definitely shallower. - Vitamin C Eye Serum - is it weird that it just feels so gratifying to smear this on my peepers? - I’ve continued with my eczema moisturiser for now but I’m looking to try the Ultra Facial Cream and I’m going to get a sample of that when we’re out of lockdown. If you’re still awake after reading this, well done and thank you.
Date published: 2020-05-25
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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

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
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