The Shelf · Vitamin C Serums: Find Your Percentage
COSRX The Vitamin C 23 Serum, 20ml
This page is organised by printed percentage, and COSRX prints the highest number on it: twenty three percent pure ascorbic acid in a twenty millilitre bottle. That is not a beginner's serum and the brand does not sell it as one; it tingles, it oxidises on the usual schedule, and the small bottle is the honest size for a formula with a countdown. For skin that has already graduated from twenty, it is the next and last step up.
Affiliate link. Price and availability are set by Olive Young US.
Why we like The Vitamin C 23 Serum, 20ml
- Twenty three percent, printed
- Twenty millilitres, so it is used before it turns
- Fragrance-free
- Texture
- A slightly viscous serum that warms on application and dries down fast
- Key ingredients
- Pure ascorbic acid, 23 percent · Vitamin E · Allantoin
- Fragrance
- Fragrance-free
- Skin type
- Normal · Combination · Oily
- Best for
- People who already tolerate twenty percent · The strongest pure ascorbic acid on the page · A short, serious course
- Works on
- Dullness · Pigmentation · Dark spots
- Made in
- South Korea
- Where to buy
- Olive Young US
- Price when checked
- $25 on 2026-10-13
- Listing checked
- 2026-10-13
Our verdict on the COSRX The Vitamin C 23 Serum, 20ml
The top of the percentage ladder.
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Where The Vitamin C 23 Serum, 20ml sits on The Shelf
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Reviewed 2026-10-13. COSRX The Vitamin C 23 Serum, 20ml appears in Vitamin C Serums: Find Your Percentage. Every product on The Shelf is listed in the product index.