Powerful-Strength Vitamin C Serum
The Kiehl's Powerful-Strength Vitamin C Serum is a serums, essence, ampoule. Our analysis of its 21 ingredients (14 low-risk) rates it Excellent (88/100). Based on its ingredients, it looks well-suited to dry skin.
The Kiehl's Powerful-Strength Vitamin C Serum is a serums, essence, ampoule. Our analysis of its 21 ingredients (14 low-risk) rates it Excellent (88/100). Based on its ingredients, it looks well-suited to dry skin.
Summarised from our ingredient analysis — not brand marketing copy.
The evidence
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
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Propylene Glycol
(Fragrance, Humectant, Skin Conditioningagent Miscellaneous, Solvent, Viscosity Decreasing Agent, Skin Conditioning, Viscosity Controlling) |
Good for Dry Skin
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Dimethicone
(Antifoaming Agent, Skin Protecting, Emollient, Skin Conditioning) |
Silicone
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Glycerin
(Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care Agent, Oral Health Care Drug, Skin Protecting, Viscosity Decreasing Agent, Perfuming, Solvent) |
Good for Dry Skin
Fungal Acne Trigger
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ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning) |
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Ethylhexyl Palmitate
(Fragrance, Skin Conditioning, Emollient, Perfuming) |
Fungal Acne Trigger
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Cetyl PEG/PPG-10/1 Dimethicone
(Emulsifying, Skin Conditioning, Surfactant) |
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Dimethicone Crosspolymer
(Emulsion Stabilising, Hair Fixing, Suspending Agent Nonsurfactant, Viscosity Increasingagent Nonaqueous, Viscosity Controlling) |
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Ascorbyl Glucoside
(Antioxidant) |
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Cyclohexasiloxane
(Hair Conditioning, Skin Conditioning, Emollient, Solvent) |
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Hydroxyethylpiperazine Ethane Sulfonic Acid
(Buffering Agent) |
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Lauroyl Lysine
(Hair Conditioning, Skin Conditioning, Viscosity Controlling) |
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Acrylonitrile/Methyl Methacrylate/Vinylidene Chloride Copolymer
(Not Reported) |
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Polysilicone-11
(Film Forming) |
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Adenosine
(Skin Conditioning) |
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Hydrolyzed Hyaluronic Acid
(Hair Conditioning, Humectant, Skin Conditioning) |
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Limonene
(Deodorant, Perfuming, Solvent) |
Allergens
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Isobutane
(Propellant) |
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citrus aurantium dulcis peel oil
(Fragrance, Skin Conditioning) |
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Citrus Limon Peel Oil
(Fragrance, Perfuming, Skin Conditioning) |
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Citral
(Flavoring Agent, Fragrance, Masking) |
Allergens
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Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate
(Antioxidant) |
No personal ingredient notes yet. Save ingredients to your profile to get good/bad alerts here.
EWG flags hazard, not real-world risk — ratings don't account for how much of an ingredient a product contains. Treat these as things to research, not verdicts. How we score →
How to use
General guidance from this product's category and active ingredients — always follow the directions on the package.
Trust & honesty
The concentrations these actives are typically effective at in research — not a measurement of this product.
L-ascorbic acid is usually used at 5–20% (around 10–15% is common). Above ~20% adds little and tends to irritate more; it also needs a low pH to work.
ASCORBIC ACID, Ascorbyl Glucoside
INCI lists don't disclose amounts, and we don't claim to know this product's levels — these are the ranges these ingredients are usually effective at, so you can tell a real formula from "fairy-dusting" a marketed active. How we estimate this.
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Alternatives
Products that share the most of this item's ingredient list.
Similar formula, but a safer ingredient profile than this product (88/100).
Other products people analyze alongside this one.