Vitamin C-23% Face Serum
The Cosiq Vitamin C-23% Face Serum is a serums, essence, ampoule. Our analysis of its 2 ingredients (1 low-risk) rates it Excellent (100/100).
The Cosiq Vitamin C-23% Face Serum is a serums, essence, ampoule. Our analysis of its 2 ingredients (1 low-risk) rates it Excellent (100/100).
Summarised from our ingredient analysis — not brand marketing copy.
The evidence
Dry Skin
No data
Oily/Acne-Prone Skin
No data
Sensitive Skin
No data
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
|
|
3-O-ETHYL ASCORBIC ACID
(Skin Conditioning) |
|
1
|
|
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling) |
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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
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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