Dupes / Serums / COSRX The Vitamin C 13 Serum
COSRX The Vitamin C 13 Serum dupes: 9 serums with the closest formula
We compared COSRX The Vitamin C 13 Serum's full ingredient list with every serum in the DemythSkin database, weighting the ingredients that do the work (Ascorbic Acid (13%), 3-O-Ethyl Ascorbic Acid and Panthenol) far above fillers. These are the closest matches, each with its own efficacy and safety score.
MATCH
Shares Ascorbic Acid, 3-O-Ethyl Ascorbic Acid, Panthenol and Sodium Hyaluronate. Ingredient lists don't state amounts, so strengths may differ.
What does the work in each formula
Every ingredient graded on the same S to D scale the scanner uses. Solid chips are in both products; dashed chips are in only one.
FORMULATION BASE (8 · 10)5 shared ⌄
The 9 closest dupes, ranked by formula match
Match is how much of COSRX The Vitamin C 13 Serum's weighted formula a product shares. Scores are each product's own, so a dupe can match closely and still score differently.
Prices are the lowest retailer price in our records; a dash means we don't have one. We earn a commission if you buy through a "Find on Amazon" link. It never affects scores or matches.
How we find a dupe
Same product type
Serums are compared with serums, from the products we've scored.
Actives count most
S and A-grade actives weigh up to 30 times more than water, glycerin or thickeners. A dupe must share at least one key active.
30% match or more
Below that it isn't a dupe. Same brand and renamed versions of the original are left out.
A label lists ingredients, not amounts. Two products can share every ingredient at different strengths, so a high match means a similar formula, not a guaranteed identical result.
COSRX The Vitamin C 13 Serum dupes, answered
What is the best dupe for COSRX The Vitamin C 13 Serum?
On formula, numbuzin No.5 Goodbye Blemish Serum: a 41% match, sharing Ascorbic Acid, 3-O-Ethyl Ascorbic Acid, Panthenol and Sodium Hyaluronate. It scores 3.8 for efficacy and 3.9 for safety on DemythSkin's ingredient analysis. PURITO Pure Vitamin C Serum is next at 38%.
Is numbuzin No.5 Goodbye Blemish Serum the same as COSRX The Vitamin C 13 Serum?
Their ingredient lists overlap closely (41% by our weighted match), but labels list ingredients, not amounts. Two products can share ingredients at different strengths, so treat it as a close formula, not a confirmed copy.
What is a cheaper alternative to COSRX The Vitamin C 13 Serum?
Of the dupes we have a price for, the lowest is numbuzin No. 3 Skin Softening Serum at $14 (a 33% formula match), against $21 for COSRX The Vitamin C 13 Serum. Prices are the lowest retailer price in our records and change often.
How do you calculate the match percentage?
We compare full ingredient lists of the same product type, giving proven actives up to 30 times more weight than water, glycerin or thickeners. A dupe must share at least one key active and reach a 30% match; products from the same brand are left out.