# CeraVe vs COSRX Vitamin C Serum

**Question answered:** Should I choose CeraVe Skin Renewing Vitamin C Serum or COSRX The Vitamin C 13 Serum?

**Short answer:** Choose CeraVe Skin Renewing Vitamin C Serum if you want a stated 10% L-ascorbic acid with ceramides and hyaluronic acid, listed for all skin types including sensitive. Choose COSRX The Vitamin C 13 Serum if you want a stated 13% ascorbic acid plus a second vitamin C derivative, niacinamide and glutathione, and you're fine keeping it in the fridge. Both are morning serums that need sunscreen on top.

By Nora Ellison. Published 2026-10-28. Data is taken from manufacturer labels; the products have not been tested.

## What this means for you

### Start with what you notice

A vitamin C serum is a morning step for dullness and uneven tone, under sunscreen. The choice is about strength, extras and how much fuss you'll put up with.

### The ingredient names, translated

Ascorbic acid is the pure form of vitamin C. It's an antioxidant that can brighten the look of skin, but it breaks down with light, heat and air. Higher percentages can sting more. CeraVe states 10%; COSRX states 13% and adds 3-O-ethyl ascorbic acid, a more stable derivative.

### How to decide

- Sensitive skin, or new to vitamin C? CeraVe Skin Renewing Vitamin C Serum.
- Want a higher stated percentage with niacinamide and glutathione? COSRX The Vitamin C 13 Serum.
- Won't keep a serum in the fridge or finish it in two months? CeraVe, stored somewhere cool and dark.

### What to expect

Brightening is gradual and works alongside daily sunscreen, not instead of it. Stop if stinging persists. We haven't tested either product.

General guidance, not a test of these products: [Topical vitamin C: benefits and formulation limits](https://pmc.ncbi.nlm.nih.gov/articles/PMC3673383/); [AAD: how to fade dark spots](https://www.aad.org/public/everyday-care/skin-care-secrets/routine/fade-dark-spots). Each product's label source is linked on its product page.

## Strength, extras and storage

[CeraVe Skin Renewing Vitamin C Serum](product:cerave-skin-renewing-vitamin-c-serum) states 10% L-ascorbic acid. It also lists glycerin, dimethicone, [panthenol](/ingredients/panthenol/), ceramides NP, AP and EOP, and sodium hyaluronate. CeraVe lists it for all skin types including sensitive, and says to store it somewhere cool and dark.

[COSRX The Vitamin C 13 Serum](product:cosrx-the-vitamin-c-13-serum) is a 20 mL serum that states 13% ascorbic acid. It adds 3-O-ethyl ascorbic acid, panthenol, acetyl glucosamine, caffeine, glutathione and [niacinamide](/ingredients/niacinamide/). COSRX asks you to refrigerate it after opening and use it within two months.

> **Skin Realist check:** a vitamin C serum that's turned orange in your bathroom isn't doing much. Buy the one you'll finish while it's fresh.

## Label differences worth knowing

CeraVe's list includes denatured alcohol and isopropyl myristate. COSRX's includes palm oil and sodium sulfite. Neither lists added fragrance. For more [vitamin C](/ingredients/vitamin-c/) options, see our [vitamin C serum guide](/articles/best-vitamin-c-serum/).

## Manufacturer sources

- [CeraVe Skin Renewing Vitamin C Serum](https://www.cerave.com/skincare/facial-serums/skin-renewing-vitamin-c-serum)
- [COSRX The Vitamin C 13 Serum](https://www.cosrx.com/products/the-vitamin-c-13-serum-%EB%B2%88%EB%93%A4)

Sources and label-check dates are recorded on the product pages.

| Product | Price | Key ingredients | Skin types | Fragrance | Flagged ingredients | Size | Source | Buy |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| [CeraVe Skin Renewing Vitamin C Serum](https://dermalguide.com/products/cerave-skin-renewing-vitamin-c-serum/) |  | Vitamin C (L-ascorbic acid) 10% | oily, dry, combination, sensitive, normal | Marketed as fragrance free | Alcohol Denat., Isopropyl Myristate | Brand doesn't list it | [Manufacturer label](https://www.cerave.com/skincare/facial-serums/skin-renewing-vitamin-c-serum), checked 2026-10-23 | [Amazon (affiliate)](https://link.amazon/B08tYa14E) |
| [COSRX The Vitamin C 13 Serum](https://dermalguide.com/products/cosrx-the-vitamin-c-13-serum/) | $16.80 at [Stylevana](https://www.awin1.com/pclick.php?p=43690852369&a=3132625&m=90791) (affiliate), checked 2026-10-29 07:35 UTC | Ascorbic Acid (Vitamin C) 13% | Brand doesn't say | Marketed as fragrance free | No flags recorded; not a safety guarantee | 20 ml | [Manufacturer label](https://www.cosrx.com/products/the-vitamin-c-13-serum-%EB%B2%88%EB%93%A4), checked 2026-10-10 | [Amazon (affiliate)](https://amzn.to/3W4rA4R) |

## Which to choose

Consider CeraVe Skin Renewing Vitamin C Serum when: You want a stated 10% L-ascorbic acid with ceramides; You'd rather store it in a cupboard than the fridge.

Consider COSRX The Vitamin C 13 Serum when: You want a stated 13% ascorbic acid with a second vitamin C derivative; You want niacinamide and glutathione in the same serum.


## Questions

### How should I store them?

CeraVe says to store its serum in a cool, dark place. COSRX says to keep the opened bottle upright in the refrigerator and use it within two months.

### Does either contain alcohol?

CeraVe's list includes denatured alcohol. COSRX's recorded list doesn't.

### Can I use them with niacinamide or copper peptides?

COSRX's serum already contains niacinamide. COSRX advises against using its vitamin C serum in the same routine as copper peptide products.