C Serum Gel
The Obagi C Serum Gel is a emulsion. Our analysis of its 37 ingredients (28 low-risk) rates it Excellent (96/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry skin. Heads up: it contains fragrance, which can irritate sensitive or reactive skin.
The Obagi C Serum Gel is a emulsion. Our analysis of its 37 ingredients (28 low-risk) rates it Excellent (96/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry 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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Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling) |
Good for Dry Skin
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Dipropylene Glycol
(Fragrance, Solvent, Viscosity Decreasing Agent, Masking, Viscosity Controlling) |
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Cyclopentasiloxane
(Hair Conditioning, Skin Conditioning, Emollient, Solvent) |
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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Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling) |
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Squalane
(Emollient, Hair Conditioning, Refatting, Skin Conditioning) |
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3-O-ETHYL ASCORBIC ACID
(Skin Conditioning) |
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ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning) |
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Salicornia Herbacea Extract
(Skin Conditioning) |
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Palmitoyl Dipeptide-18
(Viscosity Controlling) |
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Yeast Extract
(Skin Conditioning) |
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Cynara Scolymus Leaf Extract
(Skin Conditioning) |
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Centella Asiatica Extract
(Cleansing, Skin Conditioning, Smoothing, Soothing, Tonic) |
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Glycogen
(Skin Conditioning, Humectant) |
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Phellodendron Amurense Bark Extract
(Skin Conditioning, Tonic) |
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Stearic Acid
(Fragrance, Sufactant, Emulsifying, Surfactantsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Stearic Acid., Emulsion Stabilising, Masking, Refatting) |
Bad for Oily Skin
Fungal Acne Trigger
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Lactic Acid
(Exfoliant, Fragrance, Humectant, Ph Adjuster, Skin Conditioning Agent Humectant, Skin Conditioning, Buffering Agent) |
Bad for Sensitive Skin
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Diglycerin
(Humectant, Skin Conditioning, Solvent) |
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Dimethicone
(Antifoaming Agent, Skin Protecting, Emollient, Skin Conditioning) |
Silicone
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Sorbitan Stearate
(Fragrance, Emulsifying, Surfactant) |
Fungal Acne Trigger
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Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
(Emulsion Stabilising, Viscosity Controlling) |
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Batyl Alcohol
(Emulsion Stabilising, Emollient, Skin Conditioning) |
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Behenyl Alcohol
(Binding Agent, Emulsion Stabilising, Viscosity Increasing Agent, Binding, Emollient, Viscosity Controlling) |
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SIMMONDSIA CHINENSIS SEED OIL
(Hair Conditioning, Skin Conditioning, Skin Conditioning Emollient) |
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Acrylates/C10-30 Alkyl Acrylate Crosspolymer
(Emulsion Stabilising, Film Forming, Viscosity Controlling) |
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Bis-PEG-18 Methyl Ether Dimethyl Silane
(Humectant, Foam Boosting, Hydrotrope, Emollient, Hair Conditioning, Skin Conditioning) |
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Sodium Citrate
(Ph Adjuster, Buffering Agent, Chelating, Masking) |
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Polysorbate 60
(Emulsifying, Surfactant) |
Fungal Acne Trigger
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Sucrose Cocoate
(Skin Conditioning, Emollient, Emulsifying, Surfactant, Antistatic Agent) |
Fungal Acne Trigger
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Disodium EDTA
(Chelating Agent, Viscosity Controlling) |
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Laureth-4
(Antistatic Agent, Emulsifying, Masking, Surfactant) |
Bad for Oily Skin
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Laureth-7
(Emulsifying, Surfactant) |
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1,2-Hexanediol
(Solvent) |
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Alcohol Denat.
(Antifoaming Agent, Antimicrobial, Astringent, Masking, Solvent, Viscosity Controlling) |
Bad for Dry Skin
Bad for Sensitive Skin
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Methylparaben
(Fragrance, Preservative) |
Paraben
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PARFUM
(Fragrance, Perfuming) |
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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.
3-O-ETHYL ASCORBIC ACID, ASCORBIC ACID
OTC leave-on AHAs are usually 5–10%. The effect also depends on pH and free-acid value, not the percentage alone.
Lactic Acid
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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