Obagi Professional-C Serum 20%

Obagi

Where to buy Possibly in stock

About this product

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.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
11
Low-risk
7
Fragrance
Contains fragrance
Origin
United States

The evidence

Quick Product Notes

Paraben-Free Sulfate-Free Alcohol-Free Silicone-Free EU Allergen-Free Fungal Acne (Malassezia) Safe Minimal Ingredients Cruelty-Free

Notable Effects & Ingredients

No Notable Effects & Ingredients

Ingredients Related to Skin Types

Good   Bad — tap a skin type to see which ingredients · estimated from ingredient functions
Dry Skin 2/2
Good for dry skin
Sorbitol Sodium Hyaluronate
Caution for dry skin
Zinc Chloride Sodium Lauryl Sulfate
Oily/Acne-Prone Skin 2/0
Good for oily/acne-prone skin
Ascorbic Acid (Vitamin C) Zinc Chloride
Sensitive Skin 4/4
Good for sensitive skin
Sodium Ascorbate Ascorbic Acid (Vitamin C) Sodium Bisulfite Zinc Chloride
Caution for sensitive skin
Sorbitol Ascorbic Acid (Vitamin C) Phenoxyethanol Fragrance

Ingredients list

11 total
Lower hazard (1) Higher hazard (8)
All11 Skin Conditioning5 Antioxidant3 Fragrance3 Humectant3 Ph Adjuster2 Buffering Agent2 Masking2 Preservative2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
A
Ascorbic Acid (Vitamin C)
(Antioxidant, Fragrance, Ph Adjuster, Skin Conditioning, Buffering Agent, Masking)
Good for Dry Skin
Good for Dry Skin
1
A
Sodium Ascorbate
(Antioxidant)
1
2
Sodium Lauryl Sulfate
(Cleansing, Denaturant, Emulsifying, Foaming, Surfactant)
Bad for Oily Skin
Bad for Oily Skin
Sulfate
Sulfate
8
Fragrance
(Deodorant, Masking, Perfuming)
1
Sorbitol
(Flavoring Agent, Fragrance, Humectant, Plasticizer, Skin Conditioning)
4
Zinc Chloride
(Cosmetic Astringent, Cosmetic Biocide, Drug Astringent Oral Health Care Drugs, Oralcare Agent, Oral Health Care Drug, Oral Care Agent, Soothing)
4
Calcium Hydroxide
(Ph Adjuster, Buffering Agent)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
3
A
Sodium Bisulfite
(Antioxidant, Hair Waving Or Straightening, Reducing, Preservative)

My Ingredient Notes

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Key ingredients

Ascorbic Acid (Vitamin C)
Antioxidant, Skin Conditioning
Sodium Ascorbate
Antioxidant
Sorbitol
Humectant, Skin Conditioning
Zinc Chloride
Soothing
Sodium Hyaluronate
Skin Conditioning, Humectant
Sodium Bisulfite
Antioxidant

Benefits

Fungal-acne (Malassezia) safe
Good for oily/acne-prone skin

Concerns

Contains paraben
Contains sulfate
Fragrance — higher EWG

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 →

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Sodium Ascorbate
Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antioxidant
Sorbitol
Flavoring agent, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 1 Flavoring agentFragranceHumectantPlasticizerSkin conditioning
Zinc Chloride
Cosmetic astringent, Cosmetic biocide
Low-to-moderate hazard.Read moreShow less
EWG 4 Cosmetic astringentCosmetic biocideDrug astringent - oral health care drugsOralcare agentOral health care drugOral care agentSoothing
Calcium Hydroxide
Ph adjuster, Buffering agent
Low-to-moderate hazard.Read moreShow less
EWG 4 Ph adjusterBuffering agent
Sodium Bisulfite
Antioxidant, Hair waving or straightening
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A AntioxidantHair waving or straighteningReducingPreservative
Ascorbic Acid (Vitamin C)
Antioxidant, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A AntioxidantFragrancePh adjusterSkin conditioningBuffering agentMasking Good for Dry Skin
Sodium Lauryl Sulfate
Cleansing, Denaturant
Potentially comedogenic - can block poresRead moreShow less
EWG 1–2 CleansingDenaturantEmulsifyingFoamingSurfactant Bad for Oily SkinSulfate
Fragrance
Deodorant, Masking
Higher-hazard ingredient.Read moreShow less
EWG 8 DeodorantMaskingPerfuming
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Phenoxyethanol
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Morning works well: Antioxidants like vitamin C pair well with daytime use under sunscreen.

General guidance from this product's category and active ingredients — always follow the directions on the package.

Trust & honesty

Effective levels — general guide

The concentrations these actives are typically effective at in research — not a measurement of this product.

Vitamin C (ascorbic) 5–20%

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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