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MYTHBUSTERS: THE TRUTH ABOUT HOW VITAMIN C SERUMS BENEFIT
YOUR SKIN
YOUR SKIN
From boosting radiance to helping to diminish the signs of ageing to antioxidant protection, Vitamin C is a highly efficacious skincare ingredient with a wide range of benefits. There's a fair bit of misinformation circulating about Vitamin C out there, so here's your chance to learn the truth about the benefits of using a Vitamin C serum for your skin.
Fact: Not All Vitamin C Serums are Created Equal
There are actually several different forms of Vitamin C that are used in skincare formulas. While they have overlapping benefits, Pure Vitamin C or L-Ascorbic Acid is absorbed into skin and starts working immediately upon contact, it remains bioactive in skin, works to neutralise free radicals, brighten hyperpigmentation and stimulate collagen production. While Vitamin Cg (Ascorbyl Glucoside) activates once absorbed into the upper layers of skin to boost Vitamin C activity over time.

Fiction: The More Vitamin C, the Better
While it may seem like a higher level of Vitamin C would be better, these formulas can actually cause sensitivity or be less effective if they are not stabilised properly. Vitamin C can quickly become unstable when exposed to heat, light and air. If it's not stable, it won't be effective, so look out for any Vitamin C products turning an orangey brown shade.
Very high concentrations of L-Ascorbic Acid can lead to skin experiencing irritation. Here at Kiehl’s our products are dermatologist-tested for safety, demonstrating the suitability of our formulas for all skin types, including sensitive skin.
Fact: Vitamin C is also for the Eye Area
In the right concentration Vitamin C can be extremely beneficial for the eye area. Celebrated for its brightening and glow boosting abilities, Vitamin C is an ideal ingredient to include in serums and creams designed for dark circles, fine lines and puffiness. Make sure you choose a dedicated eye product as the skin under the eyes is the thinnest on the body and products formulated for the face will be too rich and may cause irritation.
Fiction: DIY Vitamin C Serums are as Effective as Other Formulas
L-Ascorbic acid is an unstable ingredient, meaning it can be oxidised when it is exposed to light, air or heat and become less effective. This powerful form of Vitamin C can be very hard to stabilise within serums and needs to be formulated at a specific pH level to ensure that it effectively delivers skin benefits. It's not something that can be done in the average kitchen! We first stabilised L-Ascorbic acid in our water-free formula more than 15 years ago in a lab!
“When exposed to water, Pure Vitamin C can degrade causing it to lose its effectiveness. A water-free formula helps keep high concentrations of Pure Vitamin C stable and effective.” – Dr. Megan O’Brien, Kiehl’s Consulting Dermatologist
Fact: Your Skin Needs Topical Vitamin C
Just as Vitamin C is an essential part of your diet, it is also an important step in your skincare routine. The human body does not produce its own Vitamin C but relies on obtaining it through nutritional and topical applications. Daily use of a balanced and stabilised Vitamin C facial serum will help your skin soak up the perks of this powerful ingredient.
Fiction: Vitamin C Serums Cause Skin Sensitivity to the Sun
This one is actually the opposite! Topical Vitamin C has been demonstrated to be a second line of defence against harmful UVA rays while also helping to bolster skin’s antioxidant defences. We recommend applying a Vitamin C serum in the morning before adding a daily sunscreen. Remember to apply sunscreen every day.
Fact: Vitamin C Products Benefit All Skin Types
The Vitamin C facial benefits extend to all skin types, including sensitive and dry skin. In addition to helping visibly fade pigmentation marks or diminish the appearance of fine lines and wrinkles, using a Vitamin C serum can also provide antioxidant protection to help defend from skin-damaging free radicals.
