The Vitamin C23
The IOPE The Vitamin C23 is a serums, essence, ampoule. Our analysis of its 35 ingredients (22 low-risk) rates it Excellent (95/100). 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 IOPE The Vitamin C23 is a serums, essence, ampoule. Our analysis of its 35 ingredients (22 low-risk) rates it Excellent (95/100). 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
Dry Skin
4/2
Oily/Acne-Prone Skin
1/0
Sensitive Skin
2/10
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
1
|
|
Water
(Solvent) |
|
|
|
ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning) |
|
|
1
|
|
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling) |
|
|
3
|
A
|
Dimethicone
(Antifoaming Agent, Skin Protecting, Emollient, Skin Conditioning) |
Silicone
|
|
2
|
A
|
Tromethamine
(Fragrance, Ph Adjuster, Buffering Agent, Masking) |
|
|
1
|
A
|
Panthenol
(Antistatic Agent, Hair Conditioning, Skin Conditioning) |
Good for Dry Skin
|
|
|
|
3-O-ETHYL ASCORBIC ACID
(Skin Conditioning) |
|
|
1
|
A
|
Squalane
(Emollient, Hair Conditioning, Refatting, Skin Conditioning) |
|
|
1
|
|
Caffeine
(Fragrance, Skin Conditioning, Masking) |
|
|
1
|
|
Sodium Chloride
(Bulking Agent, Masking, Oral Care Agent, Viscosity Controlling) |
|
|
1
|
A
|
Sodium Hyaluronate
(Skin Conditioning, Humectant) |
Good for Dry Skin
|
|
|
|
PARFUM
(Fragrance, Perfuming) |
|
|
1
|
|
Adenosine
(Skin Conditioning) |
|
|
2
|
A
|
Sodium Sulfite
(Antioxidant, Hair Waving Or Straightening, Reducing, Preservative) |
|
|
1
|
A
|
Disodium EDTA
(Chelating Agent, Viscosity Controlling) |
|
|
1
|
|
Glutathione
(Fragrance, Reducing) |
|
|
1
|
|
Acetyl Glucosamine
(Skin Conditioning) |
|
|
|
|
Gardenia Taitensis Callus Extract
(Antioxidant, Skin Protecting) |
|
6
|
|
Limonene
(Deodorant, Perfuming, Solvent) |
Allergens
|
|
1
|
A
|
Dextrin
(Absorbent, Binding Agent, Bulking Agent, Viscosity Increasing Agent, Binding, Viscosity Controlling) |
|
7
|
|
Butylphenyl Methylpropional
(Perfuming) |
Allergens
|
|
|
|
Helianthus Annuus Seed Oil
(Fragrance, Skin Conditioning, Skin Conditioning Emollient) |
|
|
1
|
A
|
Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling) |
Good for Dry Skin
|
|
|
|
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning) |
|
|
1
|
A
|
Arginine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent, Masking) |
|
|
1
|
|
Methyl Trimethicone
(Hair Conditioning, Skin Conditioning, Solvent) |
|
|
1
|
A
|
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing) |
|
|
1
|
A
|
Pentylene Glycol
(Skin Conditioning, Solvent) |
|
|
|
|
Carthamus Tinctorius Seed Oil
(Fragrance, Skin Conditioning) |
|
|
|
|
Camellia Seed Oil
(Hair Conditioning) |
|
|
1
|
A
|
Sodium Citrate
(Ph Adjuster, Buffering Agent, Chelating, Masking) |
|
|
4
|
|
Alcohol Denat.
(Antifoaming Agent, Antimicrobial, Astringent, Masking, Solvent, Viscosity Controlling) |
Bad for Dry Skin
Bad for Sensitive Skin
|
|
|
|
Hydrolyzed Carrot Extract
(Skin Conditioning) |
|
|
|
|
glycyrrhiza glabra root extract
(Bleaching, Perfuming, Skin Conditioning, Skin Conditioning Emollient, Smoothing, Soothing) |
|
|
2
|
|
Beta-Carotene
(Skin Conditioning) |
Good for Dry Skin
|
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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, 3-O-ETHYL ASCORBIC ACID
Most research uses 2–5%; some formulas go to 10%. Very high levels can cause flushing in sensitive skin.
Niacinamide
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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