Once you apply vitamin C serum to the precious area, it works by endorsing the synthesis of collagen. This powerful form of Vitamin C can be challenging to stabilize within serums and needs to be formulated at a specific pH level to ensure that it effectively benefits the skin. Kiehl’s became a pioneer in Vitamin C skincare when we first stabilized L-Ascorbic Acid in our waterless formula over 15 years ago.

“When exposed to water, pure Vitamin C can degrade, causing it to lose effectiveness. A water-free formula (such as Powerful-Strength Line-Reducing Concentrate) keeps high concentrations of pure Vitamin C stable and effective.” – Dr. Megan O’Brien, Kiehl’s Consultant Dermatologist

What Is Vitamin C, And Why Do We Need It?

L-ascorbic acid, known as vitamin C, is an antioxidant vitamin that your body does not produce naturally. You need to get vitamin C from food, drinks, or dietary supplements.

As an antioxidant, vitamin C helps prevent damage caused by free radicals that lead to cell and DNA damage. In addition, it plays an essential role in collagen production, which is a type of connective tissue that aids in wound healing. Finally, it has a role in protein metabolism to convert food into energy. You need to know that your body cannot correctly synthesize collagen, metabolize protein, or perform other crucial functions throughout the body without vitamin C.


pure vitamin C

L-Ascorbic Acid, or pure Vitamin C, is a powerful skincare ingredient easily absorbed into the skin and begins working immediately. L-Ascorbic Acid, a dermatologist-recommended ingredient, is often used in anti-aging skincare products to improve skin’s radiance and texture while diminishing the appearance of fine lines, wrinkles, and “crow’s feet.”

Vitamin Cg

Vitamin Cg, or Ascorbyl Glycoside, is a potent derivative of Vitamin C that provides antioxidant protection and helps minimize the visible signs of aging. Kiehl’s Powerful-Strength Line-Reducing Concentrate is formulated with 2% Vitamin Cg to enhance the effectiveness of Vitamin C benefits over time. I also initiate our customer-favorite men’s moisturizer.

Activated Vitamin C

Activated Vitamin C is a next-generation Vitamin C derivative with high efficacy. This potent form of Vitamin C penetrates the skin’s surface and is known to fade dark spots and skin discolorations in our formulas. Activated Vitamin C is a critical ingredient in Kiehl’s Dark Spot Corrector and Brightening Masque.

Benefits Of Vitamin C

  • Booster effect (increases cell viability).
  • It exerts an antioxidant and Detox function.
  • The skin restructures.
  • Improves appearance, providing luminosity.
  • Moisturizes and firms the skin.

Vitamin C serums: the infallible ones if you want to have a luminous skin

Here is the secret to healthier, brighter, and more radiant skin: a serum containing vitamin C. These are some of the best.

You know your skin routine is complete once you’ve applied any of these vitamin C serums, as they contain this key skincare ingredient. If one day you give yourself the task of checking the labels of your beauty products, you will realize that many of them contain this vitamin. Why? Because it is one of the best antioxidants that protect the skin, stimulate collagen production and remove blemishes.

CLINIQUE Pure Vitamin C 10%

CLINIQUE ‘s ‘Fresh Press Daily Booster with Pure Vitamin C 10%’ serum is reasonable because it works well on all skin types. Two to three drops mixed with your moisturizer will be enough of this vitamin C concentrate to illuminate, unify and texture the skin. The brand commends using it morning and night as part of your anti-aging routine.

Pineapple-C Brightening Serum

This Glow Recipe illuminating serum contains, in addition to vitamin C, AHA, a concentrate with pineapple juice that will make your face look smoother than ever. Among its main ingredients is hyaluronic acid, which helps to illuminate and tone. It also works well on all skin types, including susceptible skin that tends to redness, dryness, or illness. In addition, it contains chamomile and is a vegan, gluten-free product.

Obagi System Professional-C

This potent vitamin C serum from Obagi is designes to stimulate the skin’s collagen to give it that feeling of firmness, as well as help to improve tone and texture. It is best to apply it in the morning after bathing. When you are ready to receive that dose of softness that your skin needs.

Vitamin C Ester Brightening Serum

If you tend to have an uneven or pigmented skin tone, Perricone MD’s light and refreshing potion will be your best option. In addition to vitamin C, it blends an herbal serum, squalene, and rosemary leaf extract to make skin look visibly brighter and more even. Ideally, use it after soap and before moisturizer. For best results, use morning and night.

C-Sure Vitamin C Day Serum

This Drunk Elephant serum is an intense discharge of vitamin C on your skin, rich in antioxidants, fruits, and enzymes. Which help give it shine and reduce the signs of aging. It’s perfect for normal to dry skin to texturize, firm, and bounce, as well as fade those aging lines. The brand recommends using it equally on the neck and hands.

How to know if your vitamin C serum is oxidized?

If your vitamin C serum turns a dark color and smells like rust, it means that the vitamin C is oxidized. Therefore, you will not receive the benefits that vitamin C promises. To extend the product’s life, keep it in a calm and dark place and finish the treatment before storing the product. It is probably already rusty if you wait several months to use it again. Also, avoid getting the dropper on your skin when applying; pour a few drops into the palm of your hand and then apply to your face. Finally, as with all processes and treatments, discipline and consistency in use require seeing the desired results.

Can you use Vitamin C Serum and Retinol together?

DO NOT mix vitamin C serums that contain L-ascorbic acid with retinol (vitamin A) or niacinamide (also known as vitamin B3, commonly used in skincare formulas). These ingredients do not get along with those of vitamin C; due to their PH, they cancel each other out and leave the skin irritated, sensitive, and red.


Many details explain why we love Vitamin C in cosmetics, especially in our serum. So dare to include this super product in your beauty ritual. It is a necessary dose of vitamins, fruits, and nutrients that you cannot miss in your beauty routine. They are very long-lasting, and it is something that your skin will thank you for, looking better than ever.