Works for:
based on ingredients and %- Anti-aging
- Moisturizing
- Evens skin tone
- Anti-oxidation
Can it cause trouble?
- Irritation risk: high
- Comedogenic risk ingredients: 1
Key actives
Product Summary
"Kiehl's - Powerful-Strength Vitamin C Serum" is effective for: Anti-aging
This product could be helpful for: Moisturizing and Evens skin tone, but its actives are not the most effective or are not well-studied.
Ingredient callouts
- This product also contains Vitamin C (Ascorbic Acid) 3.50% - 5.30% It can be helpful in stimulating collagen production, neutralizing free radicals in skin and improving pigmentation marks. We recommend to use up this product quickly after opening: Ascorbic Acid degrades fast when it gets in contact with air and light. The moment the product turns orange, it is a sign that a significant share of the vitamin C in it is no longer effective.
- Adenosine 0.35% - 0.80%. It is a chemical present inside our skin cells. A clinical trial confirmed that topical application of Adenosine in a low concentration can reduce dynamic wrinkles (these are the wrinkles that appear with age in a places where our mimic is the most active, for example, in the corners of the eyes or on the forehead).
- Humectants (hydrolyzed hyaluronic acid 0.30% - 0.70% and glycerin 4.40% - 6.70%). These ingredients help attract water to the upper layer of the skin and improve the skin hydration.
Price
The product retails for 87.73A$ in Australia, for 31.98$ in the United States and for 120.00CA$ in Canada.
For a detailed price comparison: click here.
Anti-aging
What does the product description say?
Skin Type Normal, Dry, Combination, and Oily Skincare Concerns Fine Lines and Wrinkles, Uneven Texture, and Loss of Firmness and Elasticity Highlighted Ingredients , Pure Vitamin C Visibly reduces the appearance of wrinkles and other signs of aging.
Source: Sephora
This product can help reduce and prevent fine lines and wrinkles, improve skin elasticity and firmness because it contains adenosine.
These ingredients in the product can also be helpful, even though there is less evidence for their effectiveness: ascorbyl glucoside.
Keep in mind that it typically takes at least 6 weeks to notice any results because the changes that are needed to improve fine lines and elasticity happen in the deeper layers of the skin. No topical anti-aging product can “erase” wrinkles or fully reverse signs of aging.
Might help improve cell turnover and reduce inflammation in skin. One study shows that the ingredients might be able to help reduce dynamic wrinkles (for example, in the corners of the eyes or on the forehead)
A vitamin C derivative that is more stable but less potent than pure form of vitamin C. Has a potential to boost collagen production, nutralise free radicals and reduce hyperpigmentation, but the required concentration is likely to be much higher than for the pure form of vitamin C, limiting the ingredient's effectiveness in products
The most well-researched antioxidant that works in skin. Helps neutralize free radicals supporting collagen production, helping to even out the skin tone and preventing early signs of aging
Anti-oxidation
This product contains antioxidants (ascorbyl glucoside) that might be able to help neutralize free radicals in skin to lessen the damage it gets from the UV light (sun). There is not enough evidence to confirm their effectiveness in skin though.
A vitamin C derivative that is more stable but less potent than pure form of vitamin C. Has a potential to boost collagen production, nutralise free radicals and reduce hyperpigmentation, but the required concentration is likely to be much higher than for the pure form of vitamin C, limiting the ingredient's effectiveness in products
Might help improve cell turnover and reduce inflammation in skin. One study shows that the ingredients might be able to help reduce dynamic wrinkles (for example, in the corners of the eyes or on the forehead)
The most well-researched antioxidant that works in skin. Helps neutralize free radicals supporting collagen production, helping to even out the skin tone and preventing early signs of aging
Evens skin tone
What does the product description say?
Skin Type Normal, Dry, Combination, and Oily Skincare Concerns Fine Lines and Wrinkles, Uneven Texture, and Loss of Firmness and Elasticity Highlighted Ingredients , Pure Vitamin C Visibly reduces the appearance of wrinkles and other signs of aging.
Source: Sephora
The following ingredient (ingredients) in this product might be helpful, but there is no evidence to confirm that it actually works: ascorbyl glucoside.
A vitamin C derivative that is more stable but less potent than pure form of vitamin C. Has a potential to boost collagen production, nutralise free radicals and reduce hyperpigmentation, but the required concentration is likely to be much higher than for the pure form of vitamin C, limiting the ingredient's effectiveness in products
The most well-researched antioxidant that works in skin. Helps neutralize free radicals supporting collagen production, helping to even out the skin tone and preventing early signs of aging
Moisturizing
What does the product description say?
, Fragmented Hyaluronic Acid Visibly smooths and plumps.
Source: Sephora
This product can help improve hydration of the skin with the two types of ingredients.
The first type is called “humectants”:
these ingredients help attract water.
When humectants are on the surface of the skin, they “pull in” the moisture from the outside environment, or from
within deeper layers of the skin. The following ingredients in this product do the job:
glycerin, hydrolyzed hyaluronic acid.
This product also contains ingredients called “occlusives”. They help reduce the speed with which our skin loses moisture to the outside environment. These ingredients also help soften the upper layer of the skin, so it feels less tight and nicer to the touch. The following ingredients in this product do the job: dimethicone, ethylhexyl palmitate.
One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant
One of the best moisturizing ingredients. Attracts water into the upper layer of the skin. A version of it is naturally present in skin
A silicone that helps to reduce water loss from the surface of the skin. Can temporarily "fill in" lines and wrinkles, absorb oil, and create a nice product finish
An emollient that helps soften the skin and create a nice product texture
Might help improve cell turnover and reduce inflammation in skin. One study shows that the ingredients might be able to help reduce dynamic wrinkles (for example, in the corners of the eyes or on the forehead)
Used to create a thicker product texture. Helps soften the upper layer of the skin and might be able to prevent moisture loss from its surface
Helps soften the upper layer of the skin and creates a nice product texture
A type of silicone that helps water and oil mix together. Can help to soften upper layer of the skin
Helps oil and water mix together and can enhance the penetration of other ingredients into the skin. It can be irritating
A silicone that forms a light film on the skin surface helping to bind water and temporarily absorb oils creating a matt and powdery feel
A silicone that serves as an emollient. Helps create a nice non-greasy feels
How honest is this product?
| Promise | Can it deliver? |
|---|---|
| Anti-aging | |
| Moisturizing | |
| Evens skin tone |
Total Promises Fulfilled score: 83/100.
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Potential irritants
Comedogenic ingredients
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| Product | Similarity | Price | Irritancy |
|---|---|---|---|
 Kiehl's Powerful-Strength Vitamin C Serum | Current | $35.25 | |
L'Oréal Paris Revitalift Derm Intensives Vitamin C Serum | 99% | $-1.00 | |
La Roche-Posay Pure Vitamin C Face Serum | 94% | $41.99 | |
 daymellow Vita Ferol 23 Serum | 85% | $15.36 | |
 VITABRID INC. Wrinkle Serum Professional | 85% | $83.00 | |
 Vitabrid US 13 YEARS YOUNGER WRINKLE SERUM PROFESSIONAL: REGULAR PRICE | Vitabrid US | 85% | $83.00 |
Key Actives
Potential irritants
Comedogenic ingredients
All ingredients
Ingredient list view
Propylene glycol, Dimethicone, Glycerin, Ascorbic acid, Ethylhexyl palmitate, Cetyl peg/ppg-10/1 dimethicone, Dimethicone crosspolymer, Ascorbyl glucoside, Cyclohexasiloxane, Hydroxyethylpiperazine ethane sulfonic acid, Lauroyl lysine, Acrylonitrile/methyl methacrylate/vinylidene chloride copolymer, Polysilicone-11, Adenosine, Hydrolyzed hyaluronic acid, Limonene, Isobutane, Citrus aurantium dulcis peel oil, Citrus limon peel oil, Citral, Pentaerythrityl tetra-di-t-butyl hydroxyhydrocinnamate
- Surfactants and experimental irritant contact dermatitis
- Propylene Glycol
- Skin-sensitizing and irritant properties of propylene glycol
- Dimethicone as a protective ingredient in topical medications
- Final Report on the Safety Assessment of Dimethicone Copolyol
- Glycerol and the skin: holistic approach to its origin and functions
- The Roles of Vitamin C in Skin Health
- Stability, transdermal penetration, and cutaneous effects of ascorbic acid and its derivatives
- Oxidative DNA damage induced by HEPES (2-[4-(2-hydroxyethyl)-1-piperazinyl]ethanesulfonic acid) buffer in the presence of Au(III)
- Evaluation of anti-wrinkle efficacy of adenosine-containing products using the FOITS technique
- Efficacy of a New Topical Nano-hyaluronic Acid in Humans
- Physiochemical properties and application of hyaluronic acid: a systematic review
- Safety Assessment of Pentaerythrityl Tetra-Di-t-Butyl Hydroxyhydrocinnamate as Used in Cosmetics