Obagi Professional-C Serum 20%
The Obagi Professional-C Serum 20% is a serums, essence, ampoule. Our analysis of its 11 ingredients (7 low-risk) rates it Great (79/100). Based on its ingredients, it looks well-suited to oily / acne-prone, dry, and sensitive skin. Heads up: it contains fragrance, which can irritate sensitive or reactive skin.
The Obagi Professional-C Serum 20% is a serums, essence, ampoule. Our analysis of its 11 ingredients (7 low-risk) rates it Great (79/100). Based on its ingredients, it looks well-suited to oily / acne-prone, dry, and sensitive skin. Heads up: it contains fragrance, which can irritate sensitive or reactive skin.
Summarised from our ingredient analysis — not brand marketing copy.
The evidence
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
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Water
(Solvent) |
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Ascorbic Acid (Vitamin C)
(Antioxidant, Fragrance, Ph Adjuster, Skin Conditioning, Buffering Agent, Masking) |
Good for Dry Skin
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Sodium Ascorbate
(Antioxidant) |
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Sodium Lauryl Sulfate
(Cleansing, Denaturant, Emulsifying, Foaming, Surfactant) |
Bad for Oily Skin
Sulfate
|
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Fragrance
(Deodorant, Masking, Perfuming) |
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Sorbitol
(Flavoring Agent, Fragrance, Humectant, Plasticizer, Skin Conditioning) |
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Zinc Chloride
(Cosmetic Astringent, Cosmetic Biocide, Drug Astringent Oral Health Care Drugs, Oralcare Agent, Oral Health Care Drug, Oral Care Agent, Soothing) |
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Calcium Hydroxide
(Ph Adjuster, Buffering Agent) |
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Sodium Hyaluronate
(Skin Conditioning, Humectant) |
Good for Dry Skin
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Phenoxyethanol
(Fragrance, Preservative) |
Paraben
|
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Sodium Bisulfite
(Antioxidant, Hair Waving Or Straightening, Reducing, Preservative) |
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 (Vitamin C), Sodium Ascorbate
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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